Summary: We recently purchased these items and installed them in our 770 series Roomba. Thus far, they seem to work well and haven't caused any problems with the proper running of the unit. That's all I can ask for.
Summary: I've had my Roomba for about a month and so far I am really liking it. I have a very large downstairs area and got the 780 for the lighthouse features but so far have not needed them (plus I don't have C batteries. C Batteries? Really?). Roomba easily navigates about 1800-2000 square feet downstairs.
Summary: Very happy with my 780. Had it about a month now and I have it set to run 3 times a week. I have an apartment with all hardwood floors. They have NEVER been so clean, especially in the summer with my cat shedding! As others have said, you will still need to manually clean your floors, just much less often. It's great to come home every day and not have to worry about a mess. The virtual light-house units included with the 780 are FANTASTIC.
Summary: I remember when these first came out I thought it was a great idea but knew it would have some kinks that would have to be worked out. It's been years so thought I would give it a try. It's pretty good but not perfect yet. You have to block off more areas than would seem necessary. Since Irobot has figured out how not to fall down stairs and how to return and recharge itself, how come it can't figure out how not to get stuck under radiators?
Summary: I am a tech guru but I never thought that it could be THIS GOOD! Reading all the reviews I was still skeptical but decided that it might be ready for prime time, and with the money back guarantee I decided to purchase this. We are two professionals with little time to clean, and we have a large floor area all wood. I cannot tell you how much cleaner our home is now after running this robot 3 x a week!!!!