good for a bike but not too expensive ...

The attachment of the U on the bike is ok. I positioned the saddle: does not bother me to pedal, does not move even jumping sidewalks :)
By cons generates a noise a bit annoying probably be neutralized by putting foam somewhere. (Due to a)

The disc lock is impeccable: not capricious and requires no play his fingering (and his temper) to open when one is pressed for.

As against its scale does not allow me to attach all rear wheel + main vertical bar of the frame, I grabs the little bar that goes derailleur. (Because b)

Nevertheless I am a pessimist who believes that a knockdown well placed blows (c reason).

So if I had a bike a little more "everyday" things would go. But then maybe I'll buy a string that will abuse more manageable, safer