I think you will find this applied to the earlier versions. Supposedly the newer ones are OK.
The main issue I have seen is that most manufacturers have the rollers runnign along the underside of the slide out which is usually plywood with some sort of coating. This is easily fixable by installing 0.06 mil aluminum plates for them to run along.
I have had my trailer for 18 months with no issues, but I can't speak for those who have had them longer. Apparently the motors can be easily replaced. I just hope on mine its not the one against the tight wall that ever goes. I woudl have preferred a trailer without a slide, but the wife wanted one with a slide.