Oh yeah i was use 'em! Hey I have some. My friend has a big piece of land that we have wars on, its great. Just make sure your wearing a mask (or something to protect your eyes.
The only problem with the big yards is that the range on the guns arnt that great (unless you get a good [probably gas] one). The bullets often get caught in the wind, and as you can see them coming they're quite easy to dodge.
Most fun with them?
-Shot my friend in the back while I was inside, he ran and grabbed his gun and we had a massive war inside the house, bloody crazy but bloody fun. I ended up burning it outside after locking myself in the kitchen he cornered me in the garage but he ran out of bullets. So as he was walking off shot him again.
Score:
Me = 3
Him = 0
If your thinking of buying one they're very cheap online (but make sure you get a decent one, one of the ones I brought continuosly jammed and then eventually we had to trash it).
-Husky
P.S: Paintball's much better but like 10times more expensive.