Velodyne makes some very good stuff, but you have to spend a lot of money to get it. Their entry level stuff is generally beaten by the "online" brands simply because doing business that way is obviously cheaper. Companies like Axiom, SVS, HSU all make excellent product. It may have been on this board someone used the analogy: You can pick between an Audi, a BMW and a Lexus, and you're not really going to make a bad choice. Same deal here.

I use the SVS and have been happy with it. I do not doubt for a second the Axiom is a good sub, it just seems your money goes a touch further elsewhere when you're talking subs.