UPDATE:
HoRosun only took three months to get me an optic that works (for now.)
And I had to badger them before they did so.
Currently running well.
Good, mostly, to hear. It was this thread that convinced me to give one a go. Ended up with a Glock 45 and SCS. The 45 just felt better in the hand than the 19. So far I have zero complaints. Thanks 'flave!