I did have one, I used to put it in front of the tv and watch and pedal away, but I found the seat wasn’t that comfy, I gave it away in the end, and decided I preferred walking outside, I will say though I know a couple of people that have them and really enjoy using them
If you have the space, I think so. I had a Weleda? bike, but it was huge and very stable, I used it a lot until we moved 6 years ago. I made up my own exercises as well. I just don't have the space any more so had to get rid of it. I Don't feel the folding ones are very stable