The unit I have has the first upgraded motor (SN: 10XXX). I can't really complain as I got the unit and a ton of extras for next to nothing and it all seems to work perfectly so far. It has the reels for 4x5 which I plan on trying this weekend. I was going to look into getting an expert drum, however 1) They cost more than I paid for the CPP2 w/lift, processor timer, graduates, two sets of bottles, reels, tanks and a 4x5 film loader... and 2) I've read that perhaps my motor (based on the serial number) can't handle the 3006 drum.
Does anyone else have an early serial number unit and, if so, have you used an expert drum with it? If so, what has been your experience?