In all honesty I think scopes are a waste of time, possibly more for looks that anything else.
I've used a fair number of scopes, including red dots and they're fairly pointless at range due to the curved trajectory of paintballs coming out of a barrel. And there aren't really many paintballs that shoot with pin-point accuracy that would make any kind of scope worthwhile.
Now for the world of First Strike Paintballs coming out of a Tiberius T9 I would say there's possibly some good reason there. People have been reporting paintballs breaking at 500 feet from the shooter and that's something like 2-3 times the distance of normal paintballs, with an extremely accurate trajectory.
D.