I am in complete agreeance with Pascal. I have found that its all about application. In my case, I run KF 650's over SB 528's. I switched from Crown Macrotechs to QSC PL's(6.0 II's on subs, mids and high mids, 230 on highs). I found that the highs sounded maybe a little crisper... maybe. But for my application I do miss my 5002's on the subs. In my case, they did sound better with my speakers, even they have a power rating a bit less than the 6.0. I don't think thats enough to make me switch back, but if you are running subs of similar nature (something with the p300 driver) it may be something to consider. In conclusion though, the best wisdome that has been shared in this thread has been to rent, borrow, or otherwise comandeer numerous amps to see which one pleases YOUR ear the most on YOUR RIG. We are all our own toughest critics when it comes to our own systems, so if you can find what you like and are happy than you have won the battle.