[The_bluester (Paul)]

I think I would agree with that. I spent some time training the EQMOD PEC, but I could not make out any discernible difference in the guiding quality. I have had nights without it when I have had 0.6 arcsec total guiding errors and sometimes minutes between corrections, and nights with it like that but jumpy, jittery nights too. I had a power outage which zeroed out the EQMOD PEC and didn't bother to retrain it after that given it means giving up on the best part of an hours good imaging time to train it.