This is the 4th robotic pool cleaner I've owned, and it is the best of all of them. What specifically makes this one special are two main factors. First, it is the only one I've seen with the extra micron filter to catch fine dirt/sand/particles. Without this filter (as with my other robots), really fine debris simply gets vacuumed up and blown out the other end, so that it's really only pushing dirt around, rather than actually cleaning it up. And that fine filter is very effective, although for heavily soiled pools, the robot will need to be removed and cleaned often, as the capacity of that filter is fairly limited. Second, although many robots claim to navigate the pool in an organized, learned fashion, this is the only robot I've had that seems to truly move around the pool in a logical, mapped fashion, without continually repeating certain areas or moving completely randomly. In fact, it seems to truly move in an S-pattern, as advertised. The entire unit is very well made, and the quality is evident everywhere, from the case to the track treads to the filters. The app is easy to install and use, and the wireless interface between my phone and the robot is fairly seamless. The battery life is outstanding. In the listing, they state a battery life of 180 minutes, but I honestly feel like I let it run for even longer than that. Regardless, the battery life is ample, and the charging adapter is compact and easy to store. The only (very) small disappointment is the waterline cleaning. Because it is cordless/battery powered, it simply doesn't have the power to really scrub the waterline. Don't get me wrong, it absolutely will clean the waterline, but just don't be looking for it to remove harder scale or debris, as the scrubbing action is somewhat weak. But again, overall, this is unquestionably the best pool robot I've had, and 2 of the other 3 I've owned were definitely on the very high-end/expensive side. So even though this robot is not inexpensive, I'd say it is still a very good relative value for the money.