I haven't bottle conditioned in mine, but I love it for taking beer from the keg. They are very heavy duty and it's a nice presentation.
Buy from MrBeer.com, it's a lot cheaper. I can't say enough about how fast Mr. Beer ships things. I had never dealt with them before buying this growler. I bought on Monday at 2pm, had it in hand by 1pm Wednesday. I also bought the growler tap from mr. beer and it cost me $15 less than Northern Brewer. It's awesome for having tap beer on the go, but don't use it for extended periods of time since you're introducing oxygen into the beer.