I can't speak for imods sold by RWA or others, but I am glad you found the X3 better.
On the ipod quality, actually I have totally opposite opinion of yours. Keep in mind these ipods are old by now since they were initially sold around 2005-2006. So wear and tear damage/loss are expected. The life of the unit also depends on how the users exercise their cares. I have not encountered one single ipod video died in the hands of mine with either the board or the HDD. Of course, I already got rid of all the HDD's from all my ipods before they even have a chance to die. The other parts can be easily fixed or replaced.
My imod is actually a DIYmod done by audio minor with black gate nx caps