I previously had the coaxial version of these speakers and decided to upgrade to the components to bring up my sound stage. I have them powered with 50 watts RMS each from an Alpine MRP-F300. They sound great, very loud and clear, no distortion so long as you set the gain correctly. Tweeters are a tad bright, I initially had them turned up all the way on the crossover but had to back it down because my ears were bleeding. Sound much better backed off. Tweeters get incredibly loud and crisp without distorting, but don't get it confused, these are bright tweets. Def not silk dome.

Build quality seems good, I was impressed with how "beefy" the tweeter and crossovers seem. Comes with about 50000 pieces to mount the components however you want. I was able to hide the tweeters in the stock tweeter location after fabbing up some brackets, so it looks stock. :)

Can't comment on how they sound off head unit power, but I wouldn't recommend it anyway. Feed em some power and these babies sound awesome! Was a great bargain in my opinion.