kicker impulse - first subs, loved the pair in my old 91 mustang
kicker cvr - first 15" sub, alright, especially since i paid $50 bnib from a dealer
type r's - first sub after being out of car audio for like 8 years, didn't live up to the hype
jl w3 - very nice little sq subs
tc sounds tc9 - loved it, felt like it needed more power than i had at the time though
tc sounds oem 12 - overall great sub, definately my favorite so far of the few i've owned
mach5 maw15 - great sub, especially for the money. comparable to my 15" cvr off the same power, but with better sq (sealed that is, haven't yet ported it).
oz audio 250l - loved the sq, but wanted more output
and pretty soon i should be getting a shiva x so i can't wait to get that installed