Who knows--if you practice, it might even improve your trigger speed and endurance on a real marker. Probably not, but everyone else with an app like this seems to be making that claim, so maybe it''s true. All I really know is that if you poke the screen 20 times per second, it''ll show that you poked the screen 20 times in that second.
Please note that Fast Fingers does NOT support multi-touch (just like a real paintball marker, you can''t hit the trigger when it''s already pulled!), so you have to move one finger off the screen before you can tap with a second finger.
It''s a little different than a real paintball marker, so keep practicing if you can''t go quite as fast as you can on a real gun.