I read a bunch of threads about different amps with the digital(sorry, Class D) power section and couldn't really find anything that mentions any possible issues or concerns. A few months ago when I was in the market for an amp head, the sales person advised against some of the small lightweight Class D heads. He mentioned something about playing loud for extended periods would overheat it or something like that. Any truth to this? Any downside or possible concerns? Is a Class D watt equal to a SS watt? I really like the Kustom Deep End 300 head I have but when I saw the Kustom KXB500 head(the price and reviews by some of you guys), it made me consider the little 5 pounder.