It's an S7 Max V.
The get lost problem happens when it crosses a large open space with no objects to check against. It can't cross featureless large spaces without often getting confused. Typically it will suddenly decide it is 10 feet over, often inside a couch or other furniture. This is a known problem on the forums and from support.
It also gets stuck in tight spaces where there's a single narrow path in and it would have to turn around to follow that same narrow path out. For example in one of the guest bedrooms the bed was about 18 inches from the wall. In theory it can fit down that path, turn around and come back but it can't. My wife's office has a small maze of cartons. Can't do that. Gym has random weights and equipment. Can't do that. One of the back doors has some tight spaces from furniture and other stuff. Sometimes can't do that but usually makes it.
But I do give it credit for being 99% successful going under the dining room table with 8 chairs plus table legs making an ugly and randomly arranged maze. It only got stuck there once. And it was kind of funny and not it's fault that it bumped into an oven grill that was temporarily precariously leaning against a kitchen wall which fell on it and it panicked and shut itself down.
It has a mop function but it isn't really mopping. I think of it as "making the floor slightly damp". It's better than nothing but I have done countless hours of mopping in my life and that's not mopping.
Overall, I am happy enough with it but support does suck and I imagine there will be better or at least as good for much less from other companies when it's dead.
If I knew then what I know now I would've got a much cheaper no name model, saved a bunch of money, had something almost as good and been less annoyed with the failures.
I had one of the earliest roombas back in the day. It ran around all day when no one was home, picked up a ton of dog fluff, but the random walk was terribly stupid. It was ok for its era. I'm shocked to read the latest models still do that. That's pretty crazy and explains why they'd lose buyers and go out of business.