Price maybe? I think the STF-2 is less expensive (and smaller) than any of the SVS powered subs. Hard to beat the value of the 25-31 pci if the extra $150 is not an issue. Almost went that way myself but knew that the cyclinder was going to be an issue with my wife.
On the subject of spikes, my Outlaw LFM-1 (virtually the same sub as the Hsu STF-3) came with little metal disks. They have a dimple on one side for the spike to sit in, and felt on the other to protect the wood floor. I would think that with a little looking around Bplayer might be able to find something comparable for the STF-2. Might as well contact Hsu as they are possibly supplying Outlaw with their subs.
