I've got a CHT-12 and I'm very happy with it. It sounds great for movies, imo. It's not really used for music though, I have my main speakers set to large for music. I can't speak much for the 8 or 10, but I've read on a couple of times on this/other forums that the 12 is definitely worth the extra $$$. The talk is that the 8 and 10 are just a little small, but it's all relative to how loud/low you want you're sub to go. And of course, the biggest difference is going to be made with room dynamics. Velodyne do make a good sub though.
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