I don't think scopes are very practical, but I love having a red dot. I have a Phenom and utilize a red dot in my current setup. I find it very helpful, especially when getting on target first can make a difference. To make the red dot practical, I've got an adjustable riser:
With the riser it's dead on.
I've gone through two red dots so far. The first was a Tiberus Arms. It's fairly cheap--less than $40. At first it worked great, but after a couple of game days it stopped working. I don't know why. It could have been the shock of the marker. Or maybe it was the paint splatter--too much moisture?
The second red dot was off brand from ANS gear. This one held up for over a year. This last summer my Phenom fell off my tailgate and landed straight on the sight. This shattered the sight.
I really like having a red dot and I think it does give me an advantage--I play mostly in the woods or outlaw ball. But now, I'm looking to purchase a third red dot.
In the end, it's possible to get a red dot that can hold up to paintball for about $40-$60--just don't drop your marker like I did.