Well, your question was do I have experience with a Yamaha subwoofer.. and that might cause this disucssion to be pretty short.

I can say that I really like my HSU subwoofer..
http://www.hsustore.com/vtf3.html

For me, what I read on this forum and other forums directed me to purchase this sub, and I don't have an ounce of buyer's remorse.