I used a 4x4 Shocker for years...
And she was a beauty. I used to run her with smart parts barrels, revi hopper, powerfeed with air assist on a 1.9 bottle through smart parts max flo air system. It was a heavy gun, but i didn't notice it when playing, only when carrying it about...
On the plus side, it is soooo acurate. Shot a fly in the ringpiece at 50 feet once. And fast enough to compete at every level. I used mine in Millenium Series all over the show.
Its weight denotes quality. It never breaks down. Ever. And if you have to you can use it to prop up your house.
It does not chop balls. Ever.
I never had problems with gas consumption, and i used to shoot 1500 shots in a game. (that was a 1.9 though)
They are seriously undervalued and you can pick one up for absolute peanuts. Everybody should own one at least once in their life.
Phew! All worn out!