I have a set of 12" Vibe blackair subs, when I first bought them I thought that they were **** hot, but now I don't realy like them! Not as good as people make out! NOT worth the money!
I'm still running my JL 15'W3 series sub which i rate very highly and ive heard enough subs more expensive and cheaper and i usually always prefer mine (bar the 10W7 i'm closing in on ). I'm sorry to say Vibes suck. One 15 to definately avoid is the Audiobahn AWT15(i think), that doesnt drop as low as my W3 and yet is far less controlled and linear.