very quiet. I can work with him in the room and it doesn't bother me at all, I can hold online meetings without any problems. Works great on hardwood floors and easily transitions from my living room to the dining room. If the battery is low, it will not work. dies where he is, he just turns off the vacuum, then visits a GP and charges. It just works really well. I run it twice a day and am amazed at how much stuff it sucks up (especially when it goes under things like a sofa). goes away (by letting go of a string or other object). However, if you have a small cord, you should save it (and you should anyway, I've just noticed him do this a couple of times and thought it was neat, but I try to save all the cords). What needs improvement: Nothing special about it. My kitchen has a black mat and a water fountain and it's always bumping into it and spilling water, but then again, this happens with every robot vacuum. Also make sure the dock is resting against a wall otherwise it will move around and never charge (it goes without saying but I didn't do it the first time and it kept trying to dock and the dock just popped over pushed the ground). . Finally, you'll need to reset the vacuum particles almost every time you run this (if you do a full cycle/cycle of the battery). It's really easy to empty and it beeps when it needs to be emptied. Again, nothing particularly negative, just something to note. Overall I like it very much! It does a great job of cleaning up dog hair and other things that get on my floor and saves me a lot of time when I'm not vacuuming every day. If you have a pet, I would watch them first before using them. Happy with this product and would recommend! :)