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I've a lot of discussion with friends (other mirror makers) about this topic and the general conclusion was that in the climate of Perth, at least, there was little difference in use, and the main difference would only be seen if you actually tried to make a mirror yourself (ie when you got to the figuring stage you would have to be more careful). In an area where there is a small diurnal change in temperature, such as Perth, there was no significant advantage in using Pyrex-type glass. However if you live in an area where there is a large difference between day and night temps then pyrex would make more sense.
Other peoples milage on this subject may vary, as they say.
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