Mike, I say do what YOU feel is right. I can wait a few days (I am a Februarian) longer for something like this. My only question, have you tested it in this application and how hard is it going to be for you to work with? If you are that confident, then do it. If not, test it and use in March, I gotta Z-Atty-G coming in March, and would just add this to my order for my Feb Zen-mini.
This only appears to be sudden...
I've been exploring it for use on the Dragon PV... and yes, I'm confident in this material. The reason for the sudden shift is that I cannot work with this material. I lack the skills and tools to manipulate it cleanly... I had all but ruled it out as a solution on the PVs but a supplier I have been working with has contacted me and is willing to do all of the cuts in their factory and ship the tubes to me already to use.
The material itself is about 8x the price of pyrex in it's OEM form, which is still not awful. It can be expensive to have it cut and finished. I was able to come to an agreement by purchasing a large enough quantity that is can be done by them for what I feel is a reasonable price given the performance of the material.
I think this is an amazing solution, better than I could have hoped for.