if you get them cheap they are well worth it for huge SPL numbers. 1 of my customers is using 2 12.4 hcca's on 2 gp3000 amps with all the electrical to back it up and he is doing mid 150's daily in a small cavalier with a through trunk 1/2 wall setup. they do get stinky but it goes away after a couple months of beating on them with 3kw rms + per sub.retail on them is a joke I would only buy them if they were 200 or less.