I've been buying systems off of ebay for about 4 years now the last pair of subs i bought was about 3 1/2 years ago and i'm still using them!!! 2 12" L5's and a kicker KX1200.1 and everbody i know buy's off of ebay now!!!
i love ebay for just about everything... but always check amazon too before you bid/buy... they've surprised me quite a few times with better deals than anybody on ebay had... and most of their stuff is free ship too these days...