I would get it, if you can.. it is a nice lens. and mine is smooth and 'buttery' does that make sense? I will take some picts tomorrow and post them.
I am the WORST at organizing my images, and just got this a few months ago - and It will be faster if I just go take some more snaps..
Stay tuned.
P.S. I shoot with a Canon 50D - so I obviously need to use the M42 mount. It is an 8$ adaptor, that fits like it belonged on the camera from day 1, and also the lens fits PERFECTLY as well, snug as a bug..