I have a CSW SP1, 150 watt subwoofer that's part of the Movie Works 5.1 set. Great unit. I've had it and the rest of the set since 1998 and have never had the desire to buy a newer system. Plus, CSW's customer service has never failed me. Solid organization, IMO.
Replacing the sub with a newer one from CSW would have run me around $500 - $600 so I was very pleased with their repair rates.