From what I've heard, all the hifonics stuff is pretty reliable, BUT, the newer stuff does closer to rated power than the previous models which were slightly over rated.
If it were up to me, I'd go for the new one. What are the benefits of a brand new amp?
You can be sure some kid hasn't hooked it up in his "whip" with an 8 gauge wiring kit and pounded on it into clipping for hours at a time on 10 volts. Plus the new model just looks sexier //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif