I have 15 of those and use them for Apfelwein. I have yet to use them for beer because I wasn't sure if they would hold pressure. If the OP says they've worked I may bottle some on my next bottling session. I picked some up in July in the one in Schaumburg, IL and they seem to have plenty. I'll stop in next time I'm there and will see if any are left.
Cellar Door Brewery
Primary: Smoked Porter
Secondary: Flanders Red 2010
Kegged: 10.10.10, Robust Porter, American IPA
"Without algae, there would be no life on earth, the seas would be sterile and the land would be uncolonized."
-Sir David Attenborough