These guys have an awesome concept here! It looks like they really have got their act together. Where else can you have a paintball field in your backyard, unless you own a paintball field?
I've been a paintballer for over 4 years now, and I've traveled over an hour each way to get to the field I frequent the most (EMR Paintball www.emrpaintball.com ). The money saved on gas, the time saved on travel, and the hassle saved on organizing your friends at a location they may have never been to before are well worth the money paid to have these guys setup at your house. . .believe me!
Another thing; additional paint is only $45 per case! That's cheap! My paintball friends and I go through at least a case of paint each on one trip; and there's roughly 25 of us per trip. Most fields I'm familiar with charge $80+ per case (you do the math)!
You're obviously not going to get the same affect playing this in your backyard as you will playing at a regular paintball field, but imagine all the attention you'll get from the neighbors! I think these guys got a great thing going for them, and their family owned! Lots of luck! I give you a 9 out of 10!