When I was using them, premixing and bottling as usual resulted in over carbonation every time. The 1/5 TBL spoon trick worked. I must warn you, they never ever pour exactly like you'd like. I always had an extra glass for foam, and would let it sit, to top up others. Don't over charge with the co2 cartridge either, the first three pints will pour on priming pressure alone. I've got a fun minikeg project I'm working on I'll post up. The old green board had lots of cool minikeg projects, just have to search them. I remember one guy using an rv pump and small cooler to build a real cask engine. I just wish they were reliable and easier to clean, they're the perfect fridge size, and with the old philtap and stand were dispensible on their side unlike the new system where they're upright.