I'm currently busy with looking for my first (midi-)controller to buy.. But i was wondering; what's the average life-time of a midi-controller like the xone:dx? I'm asking because i could buy a second-hand xone:dx from someone for 400 ($547 ,-).. And because i don't have the money to buy a new one for 599,- (820,-) i'm really considering it. The seller says it's still working just fine but i would like to know from you guys what your opinion is. Is this a good buy? Or is it likely to show failures/defects after a short amount of time since it's already 1,5 years old..