i bought one at the weekeng (grolsch). Had ppl over for a bbq.
The empty is sittin in the kitchen. There's a warning not to re use it. I havent tried to get the top off yet, but you can see a silver co2 bulb - id say they've engineered it so that ya can't re-use it. Id imagine there is some destruction when you screw in the co2.
but its similar to a tap-a-draft system. I'll have a poke n see whats happenin with it.
Id still prefer mini kegs tho.