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The filter I was using cost the society about 4 times the price of a PST. At the time it was purchased PST's weren't available (it's several years old).
My comparisons between this filter and PST's show the PST's are significantly easier to use and as such you end up with better results. It can be tricky to align the filter with the scope, even a good rigid scope like the Megrez, and tricky to know you've got it at the best alignment. The PST is just all setup and working every time.
I know several people with PST's, one with an add-on 40mm filter on the PST. I think the 60mm filter I was using beats the normal standard PST for detail (when you get it aligned right) but the PST with 40mm filter is much better than the 60mm filter.
I only occasionally manage to get the 60mm filter working optimally, it usually requires a bit of time to tweak it to get it right. The PST's just work.
If I were buying a solar filter of some sort I'd definitely go with the didicated solar telescope (PST or whatever can be afforded).
Roger.
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