Going through the Amazon reviews for Stamina brand compact/foldable machines seems to show it's a crapshoot - my bike is a Stamina and the only problems I had were (1) it was missing one screw when it came so I had to go to the hardware store to get it, and (2) the electronic display crapped out after a couple of months, but I don't much care about that.

But the reviews alternate between mostly people thinking they're pretty good for the price, and people who got bad machines out of the box. Hm.