Also wanted to add to what others mentioned, I was amazed how much stuff Neato picks up. It's not a true deep-digging vacuum cleaner, but it gets an amazing amount of crud. I had to run it for 4 days consecutively before it got to where I only had to empty it once during cleaning, it really gets stuff.
Plus it gets where I have never vacuumed once: Under my bed. I honestly feel like my bedroom smells better now, it's less musty.
I can add that personally I like the fact that when Neato starts up in the morning it encourages me to tidy up a little and get random clutter off the floor so it can get it's job done better. Then again, I work at home so I'm here while Neato is running.
It's not very loud, half the volume of an upright vac.
But, it's not perfect. I run it every day, and so far it vacuuming my entire house without a problem is the exception, not the rule. It gets stuck after sucking up a sock sometimes, or other times it just stops... and says that something is blocking it's path, when absolutely nothing is in the way.
Also, it occasionally gets lost when trying to find it's station for recharging. It will wander around bumping into things and finally start displaying "Something is in my way" etc.
So if I worked away from home I would be dubious about relying on Neato to get through a full cleaning cycle every day. It seems to get hung up pretty often.