[casstony]

I've got a feathertouch crayford on my C11 (1.5" drawtube travel) - they're about $400 new including the adapter. It works very well, can easily cope with 2" diagonal and 41mm Panoptic/31mm Nagler, and the drawtube tension is easy to adjust and effective.

I've also got one on my Skywatcher 6" f/5 achro (2.5" DTT) - it has slightly more travel than the original focuser yet it protudes about 45mm less into the ota reducing vignetting, courtesy of a very short focuser body.

They're just very well designed and fairly light in weight and a pleasure to use in comparison with the SCT primary focuser.

EDIT: Mine are 2" focusers, I just realised you might be interested in larger diameter drawtubes.