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Allan - fused glass blanks have been around for 50 years , it just now that the chinese are making then out of plate glass and offering to amateur astronomers. What I have learn from 40 years around optics is that most that you read is self serving spin - lets see how NASA's foray into dirt cheap plate glass 40" mirrors pans out in time . Even with the buttons in between that is a relaively thin blank - the chances of it being 'diffraction limited' at that thickness and from a fused blank are zero I am afraid but that is aside . I was just passing on some actual experience in the field.
Do let everyone know how your mirrors compare - it certainly might not make any difference in the prime focus imaging world - I am an old school visual guy.
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