Thanks all
The "Scotty Research Series Remote Guiding Head" even has a sort of PEC, where I know that every few mins the drive speeds up and then slows down slightly as the gear takes up another tooth, and I adjust a speed dial accordingly, while making instantaneous corrections with fast and slow buttons. Its still a challenge guiding when only faint guidestars are available.
After getting MZ3 I will see what other lesser known but nice planetaries I can dig up.
Scott