I mount the product in about twenty minutes, no problem.
I decided to use it.
First flaw: there is not much difference between the speeds, but that does not really have a problem, I do not intend to use it extensively, especially for rehabilitation.
Well, the first 5 minutes are pretty good ... and then after 10 minutes I do not have any resistance in pedaling. I pedal in the wind.
So I contacted the support, and I expect a response from them, but in my opinion, it will be returned to sender, and can be refund request (if possible) as this seems to me unreliable.
(Thank the Amazon service for the quick response they could bring me)