I was a consistent Fitbit user but changed to Garmin after Google started messing with things.
I had one of them almost a decade ago, before Google bought them. The one that I had really just counted steps and tracked heart rates and that was about it. It could also tell time. It was one of the fancy ones at the time.
Assuming you're not allergic to the watch band like I was, it did fine. Battery lasted about a week. Accuracy was close enough that I didn't notice a major issue.
I remember that the Fitbit app was annoying as all get out, though that has almost certainly changed.
Overall I remember liking it, I think I wore it for about 3 months before my wrist started to get torn up by it.
As to what they are like currently, post Google buyout, no clue.
Had a 2 year old charge 5 and battery issues started about 1 year in. My partner had a charge 4 which did not hold charge overnight after 1 year.
Also the front panel kind of popped out for some reason, which made me get a cheap Garmin.
Also, google account requirement is coming, which sounds like a bad idea.
Other than these issues I liked it, screen was great, app used to be better.