Yes sukoy27, my Q5 was defective:
Since the first day, and everyday, when the projector is cold my Qumi do not react to any order of the remote control. So i can't turn on my Q5 with its remote. 30 minutes later, suddenly (in fact when the projector is hot), the remote start to work good!
Second problem: the fan control. Sometimes when powering up the Q5, fans accelerate too much, then the Qumi quickly turn off itself in default state.
Otherwise, the Q5 is GREAT! Very nice image, and good features.
I'm not disappointed with the Qumi, but i preferred a refund because the store was unable to replace my Q5 (black model) for the time being.