I havent used Schott yet...For what its worth, I have used Simax, Kimble, and Pyrex (corning). As far as straight consistency, quality, and clarity I prefer Simax hands down out of the three. Not even close. Unfortunately I find Kimble is the best for gold and silver fume but it has the least consistency and has the most defects such as deep scratches and bubbles. Kimble fume is great but I end up throwing out 1/3 or so of each rod cutting out defects. If you have only used soft glass till now I suspect any of these will be worlds above the soft in clarity.
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