I picked up a Sub Dude based on some good hype in threads I've been reading.
Wow - it really did make a difference in SQ in my setup.
I've got my Epik Valor sub on my hardwood floor, on the front wall about 1ft away.
On the hardwood floor I was getting some good bass, but not as musical as everyone was claiming the Valor was capable of.
As soon as I put the Sub Dude underneath - noticable improvement in 'musicality' - cleaner definition of bass notes.
Does this make me a 'tweaker'?? :D