Coff, the ones from Rebel Brewer would have had zero issue with highly carbonated brews. That's one if the features of Belgian beers, which these are made for. Its also why you use corks and cages instead of caps. The cork and cage method can withstand very high pressures.
I'm still planning on getting my order placed before they come in. I still plan to get them from Rebel too.
Just got giggles and sparging, I checked the end cost for both vendors (NB and Rebel)... I'll get it at least one day sooner from Rebel (selected UPS ground shipping) at a lower cost. NB has shipping at $26.34 where Rebel has it at $19.70 (the year I was born too... hmmmmm)... That was for three cases of the bottles from either vendor. I can't see needing more than three cases of these for some time. I'll use them for some of my bigger brews, along with the 750ml Belgian bottles I have (to share a bottle with one or two people).