I completely agree with you regarding the aesthetics of the 100 movement. I think that it truly is a much more attractive movement, one that befits the manufacture. To my eye, the 39 seems more industrial and that may be why I have yet to pull the trigger. Your information about the effects of the changes in the movement are interesting. I am hopeful that we might hear from those in the community that have had practical experience with the movements and add to the information "bank". A there is a cost differential between the two watches, I need to be convinced about worthiness of one over the other.
Mitch
I'm deeply in love with the cal 39, with i find to be a beautiful and relieable movement with a bit of history. One might not like the history, but it is probably one of the reasons Glashutte Original survived, and a link back in time.
My attraction the new Senators - and cal 100 - is the elegant watches and especially the new dial. Seeing and handling the watch a couple of weeks ago ricked my firm belief that my next GO should be a panomatic or a Panoreserve.
If I should choose my first GO today? Cal 39. Why? History and reliability.
Merry Christmas