Originally, I had a pair of SVS 20-39CS subs which, in my room, suffered from major cancellation and room mode problems. Based on TV's recommendations, I opted to sell my CS subs, rather than return them to SVS, and then bought one of the first Ultra subs available to us common folk. It has performed admirably over these past months. Still, I yearn for more bass in my room, from a single subwoofer. Recently, SVS announced that they were offering an upgrade for the CS subs which brought their performance "almost" up to Ultra standards. I was very happy with the fact that others could now enjoy the deep, relatively flat bass that I've heard for months for a few bucks less. That is good business! Then, I read that the Ultra driver had also been upgraded to the new and improved Ultra driver which surpasses the old Ultra driver in both flatness and output. Since then, I have been waiting for that same upgrade program to be offered to us early Ultra Adopters... IMO, not offering it to us is Bad Business! When is SVS gonna offer this upgrade progam to us too? Thanks for your help SVS!!!