There are no quality issues with this product. It has been in production for 13 years with no major issues - unheard of in it's class. There are hundreds of thousands in consumers' hands, so you're going to see complaints on the internet from a certain percentage. It's the nature of electronics.
Most issues stem from the control pod's DIN plug, which sticks out from the back of the subwoofer. Unfortunately, it is a bit exposed to bumps against the wall, desk, feet, etc - just be cautious. We did redesign the plug into an L shape a few years back to help alleviate this.