We just received the robot yesterday, February 3, 2023, so this is a preliminary review. Setup was straightforward as was connection to wifi and the app on my phone. My biggest concerns are with the app, not the Robot itself.First, there are few directions within the app. Thus I had to search through the various menus and randomly press buttons in an effort to find something. Then on several occasions I found the item I wanted to find wouldn't show up at all until the robot completed it's first full cleaning. It's a learning curve I know, but they could have helped a lot more than they did.Then after the robot completed the first cleaning, magically, a map of the house appeared and once I got the image turned rightside up, it was simple to name the rooms. But herein lies a small issue. The app provides a list of room labels to choose from, but there appears to be no provision for customizing names. Hence, my wife's sewing room became the "Playroom."I knew there was a place to set the robot's suction power (Eco, Normal, Max) and after 20 minutes of re-searching, I found it. However the setting appears to apply to all the rooms to be cleaned. This is fine if you have all carpet or all smooth surfaces. Most of our floors are smooth but the master bedroom is a rather deep pile carpet.The app allows you to name each room and send the robot off to clean all, several, or just one. This is nice. But having that capability without the ability to set the suction level for each room separately seems rather brain-dead!That's my compaints so far. Lets move on to the more positive aspects of the robot.I mentioned, the fairly deep pile carpet in the bedroom. The robot handled it with aplomb. There was a noticeable change in speed and ease of operation but it pushed through without a whimper. I had it on normal power and would prefer "Max," but will try that later.The map it produced was remarkably good for a single cleaning run and I could easily determine which room was which, once I got it rightside up." a single cleaning run" could be misleading. Two full charges were needed to complete the cleaning. The app does provide a decent report of the robots activity. It started cleaning at 9:56 am, then briefly docked 30 min. later (orientation ??) and resumed cleaning after emptying its dust bin. The battery ran low (about 30%) after 83 minutes of cleaning time. 3 hr. and 15 min. were required for the battery to recharge. It then cleaned (with an intermediate docking) for nearly 2 hours where it died in our bathroom with 5% charge showing in the app. We carried it back to the docking station where it exhausted the debris and began recharging. 6.5 hours were required from staart to finish. This isn't good, or bad, It;s just information for you.The app says 2276 sq ft were cleaned. This is about twice too much. About 1350 sq ft (gross outside dimensions) were available, but that includes closets, furniture, bathtubs, etc that block the robot. I did notice that it systematically recleaned numerous areas on the second charge, So I don't think their numbers are wrong, just duplicated.Its ability to navigate appears to be excellent. It does travel in long, precisely straight lines when it can. Though it seems to turn around at about 20 ', regardless. When it approaches a wall or furniture, it will slow and gently tap the barrier, or turn just before reaching the item. It typically turns corners around furniture efficiently, though there is sometimes a bit of wasted spinning around.Except for the time where it ran out of juice, it effortlessly relocated the dock to recharge and empty the onboard dust bin.We have a pet cat with 2" fur, very fine fur, that sheds constantly. There is no reason that cat isn't totally bald! The roller brush and side brushes seemed to handle it well. Both were relatively free of her fur. I know I will have to clean the axels and the roller every few weeks but it should be tolerable.If I think of it, I'll add to this review at a later date.So here is an update. It's now April 21, 2023 and I'm still very pleased with the machine. It seems to do a good job on our hard surfaced floors as it seldom misses visible debris. The degree of cleaning on our carpets is harder to know, but the dust bin always contains an abundance of cat hair. Speaking of cat hair, the roller NEVER clogs with cat hair. However, the axles on the roller do collect hair. I have to clean them every 2-3 weeks as the machine stops and says "my roller is clogged." That said, the roller axles are very easy to clean. No tools are needed since the roller cover just snaps in and out and the roller then lifts out nicely exposing the axles and housings. Though a small pick is needed to clean one end of the axle.The shark never gets caught in a corner or tight spot when there is a path out. Our Neato used to get caught frequently for no good reason. The shark has gotten caught a few times on cords, shoe laces etc, and twice has run up on the track of our patio door and gotten stuck but it is vastly better at returning to the base station than our Neato.I have the "Extended Clean" option turned on which tells the Shark to continue cleaning until it needs charging. Lately it has run out of power a few times and had to be manually returned to the base station . I will try it with extended clean "Off." This may cause it to take longer to clean the house but may increase reliability.The attached photo illustrates the depth of pile in our carpet as well as the manner in which it cleans. The shark is quite systematic when cleaning but it does sometimes cover some areas twice.We have some open grates on our floor and the Shark traverses them without issue. The Neato would stop on them and discontinue cleaning so we had to use the magnetic strips (supplied) to avoid this issue. The shark recognizes the magnetic strips, but they aren't needed for the grates.I empty the dust bin on the base station probably once every 3 weeks which works fine. That's all for now.Here's another update,. It is now January 10, 2024 and the Shark has 11 months under it's belt. It started doing weird things/errors after about 6 months so I replaced the battery which was needed with our Neato and it took care of our problem. It continues to perform well until it picks up a small rock or pea sized chunk of dog food, which happens frequently now that we were forced to change our little dog's food for medical reasons. The shark does pick up these items but they fail to exhaust into the dustbin and lodge either in the throat of the dustbin or get stuck in the spring loaded door on the Shark. When that happens an error occurs and the shark ceases operation. This issue is simple to fix. However the most annoying thing is after clearing the blockage, the Shark doesn't pickup where it left off. I have to select the rooms that were missed (very nice capability by the way) and tell it to start cleaning again.May 14, 2024The shark, as near as I can tell continues to function normally. However, the dustbin's failure to empty and subsequent error messages that prevent the unit from continuing to clean has finally pushed me over the edge. It is rare that the entire set of rooms get vacuumed. Most days I have to restart the machine at least once during the cleaning cycle and then it "forgets" where to restart. The bottom line is it's too frustrating to use now and it's going in the trash.