Apologies if this is too late to be useful.
They're brilliant. Ours is the red LG Roboking (HomBot in UK):
http://forums.whirlpo...t.au/archive/1860835.
We have two dogs and our floors have never been so clean. It vacuums around them then goes back to finish after they've moved. Copes with carpet, polished floors and tiles. Would be best for a single storey home as could do the whole thing with no intervention – if battery runs out it recharges then continues from where it left off. However, it's easy enough to pick up and move to a different level and the cliff sensors stop it falling down stairs. It's the only time I've seen OH get excited about housework. However, the downside is you can waste a lot of time just watching it work.
Minuses: can't climb more than about 1cm and can get stuck on thick rug fringes; can't do stairs; need to tidy up first; doesn't get right into corners and can shut itself into rooms. Having said that I wouldn't be without it and when used every day it doesn't matter if some bits get missed.
There are lots of reviews and comments on Amazon. I was keen on the Neato but unfortunately they stopped shipping to Oz.