It really does turn some heads! It really is a loud kind of pow!, and the thing even recoils a bit. Right now we're working on fixing the arm so that it can aim, because being so old, the gearbox has kind of fallen aprt and needs an overhaul. I would also like to add another compressor to it so it'll charge more easily. It's been so long in the making. We threw together the tank and barrel in about four days, then sat for three weeks waiting for the Lowes valve! Our store recently discontinued their stock, and the main distributor was out of stock oddly. Anyways, we're fine tuning the range now, and we can currently get like 40-50 yards. The t-shirt projectile itself is the object of attention right now.
Something else I though was really cool that I'm sure your's does too: when you fire that sucker, water condensation wisps out of the barrel like gunsmoke. Pretty flippin awesome!
P.S.- I'm the idiot on the hill!

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Reading makes a full man, conference a ready man, and writing an exact man.
-Sir Francis Bacon
"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction."
-Albert Einstein