Hey guys ive just installed one of these into my 33 and its not too shabby at all. Its ideal for ppl who dont want to sacrifice boot space but still want a bit of bass. (Ive got mine positioned under the passenger seat). The sound is not too bad considering the price and size of the unit, of course its not ground shaking bass but its good if you just want to fill out your sound nicely (I only had two 6.5 inch two ways in my front doors). Also its a powered sub so you don't have to buy a separate amp to run it. I ordered mine online for under $200 delivered.
Cheers