Compensators are a bit louder but the thing you notice the most is how the gun sits back in your hands after you pull the trigger. In a regular glock you get the muzzle flip but in a compensated glock it feels like all the energy is froced straigh back into your arm. It wouldn't seem like it makes much of a difference but it really does. As far as blinding you when you shoot at night I'm pretty sure it won't but it is cool to see the flames come out of the top of the slide and bbl.
I'm with ngcsugrad09 pick a caliber and stick with it, but whatever you do stay away from sig. It's not a bad round its just a pointless round if you ask me. It's a 40s&w case that slims down at the neck to a 357. I had a g31C and it shot 357sig. I hated buying ammo for it because it was $28/50 and that was about the cheapest that I found. I loved the gun but hated the caliber.
I'm with ngcsugrad09 pick a caliber and stick with it, but whatever you do stay away from sig. It's not a bad round its just a pointless round if you ask me. It's a 40s&w case that slims down at the neck to a 357. I had a g31C and it shot 357sig. I hated buying ammo for it because it was $28/50 and that was about the cheapest that I found. I loved the gun but hated the caliber.