I bought a Neato on Woot the last time it was offered, and have been using it for a number of weeks now. extremely happy with it. here's a number of observations so far:
1) it has definitely reduced the amount of vacuuming we do ourselves. I run this each weekend while my wife and her mom are out. it cleans our 3 bedroom single floor home (I'm not exactly sure of the sq footage) in 3.5 hours with one stop for a recharge. we used to vacuum ourselves each week but now it's about once a month.
2) it's gotten stuck only two times. once on the fringe of a rug in our family room, but I fold that underneath now and just leave it like that. the other was on a rubber band that got wrapped around the roller. it was easy to remove - just pop that part open, and remove the roller.
3) emptying the bin is just as easy. you push one orange lever and you can remove the bin. pull the filter off and dump the contents. everything snaps back together just as easily.
4) updating the firmware is easy too. you download an updater to your pc. plug in the Neato to your USB, and let it go. I haven't really noticed any difference since updating the firmware, but I wasn't experiencing any trouble in the operation of the unit either.
5) people have described the sound as a jet taking off - that is accurate. but I am often here when it's running, in our home office with the doors closed. I can watch a movie with normal headphones on and not be disturbed at all.
6) it requires 3 feet of clearance on each side and in front of the device for where you want to park it's docking station - that helps neato maneuver for docking. we didn't have a lot of free floor space by the walls, so we had to move stuff around to make the space for it. knowing the space requirements before buying it would have saved us some frustration trying to find a place for it.
7) I never had a roomba so I don't have a reference for comparison, but the neato does bump into things. in our foyer we have a table with some other things underneath - I notice that neato has pushed those things around a bit. one of the items is a glass container and it's moved but otherwise unharmed, so I suppose it's not bumping into things very hard.
8) neato does better on carpet than hardwood floors. we have hardwood floors in our kitchen that have pretty deep grooves - wife says that neato misses grains of rice in those grooves ( though I have never noticed it). it does an ok job against the walls and in corners, but not as good a job as you'd do with a regular vacuum.
9) the proof is in the bin - I was really surprised at how much crap this thing actually picked up. the bin has enough capacity to vacuum our entire place, but it's always nearly full.
10) the house just feels fresher. there's nothing like coming home from an outing to freshly vacuumed carpets. and because I don't actually have to do any of the vacuuming, I take the time to move chairs around so neato can get under our dinner table - we hadn't vacuumed under there for as long as I can remember. a little prep (in comparison to how much work and time you save) goes a long way.
in summary, for a relatively new customer, I'm a believer. you can't beat the convenience and time you save, and the maintenance has been really low so far. I've paid more for a vacuum that I had to push around myself. I would have bought a neato a lot sooner if I knew how good it would be.