I haven’t fermented in it
I haven’t fermented in it yet, I ordered a Pliny the Elder kit from MoreBeer, and I hope to make it this weekend. The flex is very solid, it is very well made. The only thing I’ve noticed so far is the hole in the lid where the airlock goes has a sharp edge and put a slice in the airlock. I’m concerned, after a few uses, some of the rubber may cut off and fall into the beer inside. I don’t know for sure that will happen, but it’s something I’ll definitely be watching for.