Personally, I've used both "pyrex" and quartz tubes and have had them both break on occasion. Recently a 3 foot fall onto tile was just too much for that quartz tank to handle.
However, a very wide walled pyrex (on an earlier similar sized tank) did the same thing with a similar fall.
I strongly disagree that there is a problem with the Kabuki glass. I think one break in 5 months is pretty darn good for the various oops this vaper can have with her gear.
Back to differences in the types of glass --
Like much, there are various opinions on the type of glass used for our tanks. I found this quote from IB Tanked and thought it may be of interest here as it clearly says that all "pyrex" is not the same. As I understand is, borosilicate is the glass we loosely call pyrex.
"Not all borosilicate is equal, there are maybe only a handful of manufacturers who produce high quality borosilicate glass. Ours is produced by Simax and they are regarded as well as it gets in glass tubing. Most borosilicate glass of chinese origin is not considered as a quality product in dimensional consistency, true borosilicate component ratio or annealing which is where stress is relieved from the glass and a big part of where its strength comes from so its impossible to tell what you will get from one lot to the next."
I've read that sentiment a few times from various people during my vaping adventures. It helps explain how FT glass is often not as durable as other offerings.
Here's the whole thread that quote is from, if anyone wants to read this view in detail:
The Glass Facts
