You could have asked here:
http://smashboards.com/threads/falco-king-of-the-birds-game-play-discussion.367184/, so thread's getting locked.
As an answer: Falco's Reflector's damage multiplier is 1.2x, Accele-Reflector just leaves them at 1.0x, but doubles their speed, and Reflector Void does reflect physical projectiles, but I don't know its multiplier. Source:
http://smashboards.com/threads/counters-reflectors-and-absorbs-wip.369298/.
As for startup and total frames, Reflector's startup is frames 5-14, so 10 active frames, and it has 50 total frames. I don't know what frames it reflects since I'm going to assume frames 5-14 is just for the physical hit and since it reflects while moving back before Falco catches it. It probably will reflect from frames 5 to 14, but the rest, I have no idea. This goes for Reflector Void too which is frames 13-21, 9 active frames, and 64 total frames. Accele-Reflector's the only one that doesn't reflect while moving back, so it's just the same as the physical hit: frames 9-13, 5 active frames, and 50 total frames.