Used, or tried to, them a few times.
1st time, I was a bit drunk (I, still, to this day, blame the fresh air sniper) and decided to walk the 3 and a bit miles home. Had done it a few times before. All I had to do was follow the A41 north west out of Wolverhampton and I was there, but I failed miserably. Ended up not following the A41 and not knowing where I was (had I been sober, I would've known where I was. Also had I been sober, I would've been perfectly capable of following a straight road!). I had heard of Uber and managed to squint through one eye just enough that I could download the app so a nice Uber driver could come and drop me off at home.
A couple of times after an evening with the Mrs in Brum, we'd book an Uber from Wolves and drivers would accept then cancel the booking a short time later. We would get a normal taxi in the end.
Haven't tried to use Uber now for a few years. Now we're back up north, I think I've seen one Uber car in 3 years, so not sure Uber is really a thing up here, well not out of the cities anyway.