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The PST created the market in cheap H-alpha. The early ones had problems with "rust" forming over time on the front lens, which apparently affected viewing quality but not, I understand, safety. (Please correct me someone, if I am wrong on this important subject.) The newer ones don't have this problem, but watch out if you are buying second hand.
I see there are other solar scopes from Bintel. I know nothing about these. Certainly H-alpha is much less boring that conventional solar viewing. And while revolutionarily cheaper, these scopes are still pricey when you consider they have only one target. Value for money? The answer to that reveals more about one's disposable income than anything else, but who's going to tell you that? I'd answer "yes", but I already own one. What sort of chump would I be if I answered "no"? Try to look through someone else's before committing.
Cheers,
Brian
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