co2 for airing up your buggy

[addict]

I have a friend who owns a shop that refills painball gun co2 tanks. I asked him if they sell a smaller tank and he says they do. It's about 2 feet in height and holds 20 lbs of co2.

My question: Does anyone have any experience with these tanks for their buggy? Is it a good/bad idea? The price for one of these is about $150 and can be refilled for about $20. I have no clue how many air-up I can get with this setup.

Thanks for any thoughts...