OK, let me just say right off the bat that I just received The Bot (which is what I named it) today, so I can't comment on quality, longevity, tendency to break down, etc. I just wanted to give my first impressions.Over the last couple of years, I've known people who have had Roombas and they've been very happy with them. I had been looking to buy one for quite some time, but I wanted to wait until I found one that was affordably priced (IMO) while still having some more advanced technology, not too basic. The one I got was the 600 series (the Roomba 675), which works with Wi-Fi and has an app that you can download, whether you have an iPhone or a Droid. For some reason I was under the impression that it would work with Alexa, but it seems I was mistaken.It came in a very sturdy box and included a spare filter, a page with quick setup instructions, and a thankfully short owner's manual in the usual 3 languages, English (I noticed a few typos LOL), French, and Spanish.I was able to set it up very quickly, basically putting the dock on the floor near an outlet, plugging it in, and putting The Bot in the dock. It started charging immediately, although the owner's manual says that it already comes charged and could work right away. Anyway, while it sat in the dock charging, I downloaded the app and went through setting up the Wi-Fi, also a snap. The first time I ran it on my tile floors downstairs, it was because I accidentally pushed the button in the app LOL. It found its way around my front room, bumping gently into this and that, not hard enough to damage any of the moldings, paint, furniture, etc. At some point it decided to go back to the dock, probably to charge, and it docked perfectly and started charging. The second time I sent it for another run, I kind of had to encourage it to go into the other room, which it did. After about 15 minutes I ordered it to go back to its dock through the app. It took a little while for it to find its way back to the other room and dock, but again, it went back and docked itself perfectly.The first time it encountered a floor mat by my front door, it backed off, but the second time, it went onto the mat and vacuumed it (yay!) In my kitchen, I have a very ergonomic and cushioned rubber mat near the sink. It had no problem climbing up onto that and vacuuming that (yay!)The owner's manual has excellent information with diagrams, all of the parts being labeled, troubleshooting issues, and maintenance instructions. Regarding maintenance, it recommends emptying the bin after each use, cleaning the filter and brushes once a week, cleaning the front caster wheel every 2 weeks, and cleaning the side brush, the cliff sensors, and the charging contacts once a month. I do plan to empty the bin after each use (more on that later), but the rest seems kind of excessive to me, since I'm the only human in the house and I have no pets. I really only plan to use this maybe once a week upstairs and downstairs. I can eyeball the parts and see if they need to be cleaned periodically.Regarding maintenance of the various parts, in terms of replacing them, they recommend replacing the filter every 2 months, the brushes every 6 to 12 months, and the front caster wheel every 12 months (not sure why). This also seems kind of frequent to me, so again, I will just monitor their conditions and change them when I feel it's necessary. They have diagrams for how to clean and change all the various parts.One of my friends had a Roomba that was so loud it would scare the bejesus out of you if it started up and you weren't expecting it. I would say that mine does not seem to be that loud.To my surprise, when I emptied the dustbin, which was very easy, there was a lot of dirt, hair, and dust. So I'm very satisfied. I did follow The Bot around here and there, and watched it pick up things off the floor. I didn't see it leave anything obvious behind, and certainly my floors are cleaner than they were before.I couldn't find any specs, so I took measurements myself (although I guess you can probably find them online). The Bot is about 13 inches in diameter and seems to be not even 3 inches high. It had no problem going under most of my furniture, which I'm really happy about because there's always dust under there.Little update: I took The Bot upstairs, and let him cruise around for a while. It's a mix of carpet and tile. There was a good amount of dust and dirt accumulated in the bin. He did a great job going under the bed, vacuuming various floor mats, navigating door sills, etc. So far so good.All in all, caveat being that this is only the first day, I'm very satisfied with it, and I hope it has a very long, healthy, productive life here!