ive heard nothing but good things about them. there is a guy on caraudio.com that has 2 RL-p 15's and a profile 1400 watt amp i think and he is hitting 151.7 or something in the 151's. the reviews are good, and mike seems to be an awesome guy. ive heard they are comparable to the x.x.x and the brahma just not quite the spl. but not that far behind either..and they just lowered there prices too so thats a plus.