I have these and I use them the legs themselves are on their third batch through them the first time I used them I used half of the 4.5 ounce priming sugar that came with my brew kit second time I wanted a higher carbed beer an used 3.5 ounces and that was too much this time around I mini kegged half a batch of Austin Homebrew clone of summertime kolsch and I used 2.5 ounces the other half I bottled. I have six mini kegs and what I have been doing is kegging half of the batch and bottling the other half.
I have had no keg bombs odd bulges or ill effects from using the mini kegs and I also use the party star tapper as well. Mixed success there make sure you have a good seal.
Small Cap Brewing.....
Drinking: Some great homebrew.