I've had a pair for 2 years (?) now and just depend on them to give me the data I want. I always found them difficult though to get in and out, at first I couldn't even do it outside and rode with one foot out for a few days when on the street as opposed to a bike path. To this day I find the same as others with getting into them as they spin so freely if you don't manage to get in on the first try.
As for Duo vs. Uno, I bought the duo, found out that I too was 50/50 or so on my rides and never looked at it again. I'd buy the uno if given the choice now and save the money.
And one other thing about clipping out, with my regular Keos I could twist my foot either way, but with the Assioma you can only twist one way because of the sensor. Of course I was used to twisting the other way so I had to relearn the motion. I never had to join club Tombé at least.