I have had my SW80 for a number of years and am generally happy. It was originally bought for a small Pro-Logic system and I have to admit that in my current DD setup, its underpowered. But its quite effective. I have seen a lot of hype over the Rel Q150 and am interested. But I wonder How much better the REL will perform... Its a lot to spend if there is little improvement. What worries me is that according to Yamaha, the SW80 will go as low as 23hz, but the Q150 only 28hz.. So in theory the Yamaha is able to go lower. Has anyone got first hand info about the Q150?