The keezer is built and I currently have three kegs in it filled with pumpkin ale, a really good session beer, and some hard cider. I was having issues at first as the cider came out as foam, the pumpkin ale keg would not stay sealed, and the session beer was perfect until it ran out of CO2.
I had the Brewmaster and Yeast Wrangler over for a brew day and let them take a look at it. I thought I was out of CO2 due to a valve or keg leaking. After about 15 minutes we found that I did not have it hooked up properly. Always remember to have a check valve coming out of the regulator, but do not put a check valve on the CO2 line into the manifold / distribution block.
This means you will most likely need this adapter which is sold as an accessory for the Blichmann BeerGun.