I just picked up my ESP LTD D6 from a friend who took it to a local luthier (Jimmy from J Gravity in St. Louis) to be defretted, and WOW. You can hardly tell it had frets on it previously. The 2 truss rods and dense neck through body give it sustain for days, and the mwah...oh the mwah. He even replaced my gigantic strings, set it up great and threw a coat of plastic epoxy on the fretboard. Who else plays a fretless six? I was hesitant to have it done at first until I got good on a cheap fretless 4, and since then I've been hooked on playing fretless.