Aside from all the wild reviews on their site, does HSU's variable tuning frequency really make that much of a difference, compared to non vtf subs, such as SVS cubes and cylinders? I've also heard rumors that HSU subs aren't as well made as others, having the tendency to screw up and cost a fortune to repair since they aren't exactly as main stream as other subs.

Also, how about any preferences or recommendations for a nice music-oriented sub in general - Whats your favorite sub and why, and do non sub-only companies even have a chance?