If it helps anyone, I bought the ASD, it arrived yesterday. Glossy.
I'm in a bedroom office at home, window to my right side (not behind me). No other windows or lights behind me.
I can indeed see reflections from the light which hits the door behind me. But, I have to look for them. Working normally, I haven't noticed it, but if I do focus, I can clearly see my door in my ASD refraction.
Basically, it's like an LG OLED TV reflection (when it's turned off). Once you're working, in normal home conditions, it's fine. The colour pop and sharpness is fantastic, makes me remember how good glossy is.