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In Australia there is no real need for Pyrex. While it may be nice to have a Pyrex Primary it doesn't really matter. We don't go from 24 degrees inside the house to -20 outside.
Also, Corning Incorporated has stopped production of Pyrex and Flourite Crystals. They have moved into new materials. Once all the Pyrex and Flourite is gone, it's gone. The new material is 'ULE': ultra low expansion ULEŽ glass, a material that exhibits virtually no dimensional changes over extreme temperature variations and is generally considered the best in the world for astronomical optics.
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