I have several glow discs in my regular bag. The glow discs hold up as well as their counterpart plastic; DX ... as well as other DX, Z as well as other Z, champ as well as other champ, ... etc. I've "heard" that it can cause the glow compound to lose its properties faster using them all the time in daylight but I haven't found a single discs yet that's has stopped glowing or doesn't seem to glow as brightly as it's backup disc (other than from dirt/scratches). I actually LIKE playing with my glow discs regularly so when I do have a glow round, I'm familiar with a majority of the discs I'm throwing because I use them frequently.
As far as stability ... I know innova had more over stable champ glow (based on higher PHL, most likely cooling different than normal champ) discs that their standard champ ... but I've heard they are getting better at flying like the normal disc in their later runs. Discraft, I haven't seen this to be "typical" like it was with innova for a while. I had glo Z buzzzs that were less stable than my regular Z or my BS buzzzs.