I have the same product as the_bird, just got it after new years, so I've only done one batch with it. Like he said, it hooks up to the disposable bottles of O2, they cost about $8 each. Don't crank the gas at 100%, more like 50%, and I found it helped to slowly move the stone around in a big circle around my fermentation bucket. I probably aerated for a minute and a half, from what I read that was longer than necessary, but I was getting a feel for it as it was the first time I used it. I pitched the yeast from a 1 gal starter into a 5.5 gallon batch, which I also had added a bit of yeast nutrient. The starter started pretty quickly, and 36 hours later, it was done. I was using danstar nottingham, and my batch was about 68 degrees, and it was fermenting as if it were about 5 degrees warmer (experience from past brews). I'm glad I bought it, should come in handy for the lagers as well.
