The Party Pigs are just OK, I had several of them a long time ago and gave them what I thought was a fair shot. You still have to prime with sugar, as the pressure pouches only work to push beer out of the Pigs and do not carbonate the beer. The pouches are a recurring cost which got pretty annoying for me. And then the pressure pouches have to be "activated" by pumping air into the Pig with a clunky hand-pump. Then when the pouch activates and fills the pig with pressure, you bleed off the air inside, and start dispensing.
There is a collar assembly which fits around the neck of the Pig to seal the push-button faucet into place. It was more annoying for me to assemble than it should have been. The last straw for the Pigs for me, was the time I *thought* I had installed the collar and tap, then pressurized the pig to activate the pressure pouch The collar was in fact not installed snugly (operator error, I admit), but the activated pressure pouch caused beer to spew out of the pig until the pouch was spent. It was an unholy mess.