Has anyone shot the Air Arms Alpha pistol?

Is there an aftermarket cylinder with slightly more capacity or a pressure gage for this pistol?

What should I do about a tank for filling?  Deals, best value, reasonably compact size for taking along in a vehicle.  I'm about 99.9% certain a hand pump is not in my future for charging one of these guns.

No doubt I need to do some checking around.  There's a welding supplier close by home, and a dive shop fairly close to work.  The only shop that specialized in paint ball that I know about closed up.

The airgun sellers have some neat tanks, but the prices are impressive, even for a small one.

ETA:  I just missed a used scuba tank for sale at the dive shop, unless the kid it's promised to doesn't show up to pay up tomorrow.  It's tested, filled, and comes with a card for 15 more fills.  I'll buy it on Saturday morning if he doesn't get it tomorrow.  Then I'll have to buy a gun to go along with the tank.

ETA 2:  Bought the tank.  I was still on the fence, but I decided it was a pretty good deal.  $90 for everything is probably the best deal that will come along.

Now I need a gun and I'm battling my champagne tastes.  I wonder if spork reads this forum and whether he could point me in the direction of a good second hand 10m pistol.