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I also use the Astronmik OIII (in a 10" newt and a 16" lightbridge) and find it great. The other thing I like is the coatings are very hard wearing. I've dropped the filter in the dirt, just rinsed it off and given it a buff with a lens cloth and it was like new.
Astronomik state on their site that unless you have silicone carbide (from mirror grinding) there is hardly a chase you will scratch their filters.
I do intend to buy a UHC filter for viewing from home and this will also be an Astronomik, so you'd have to say I'm happy.
I can't comment on other manufacturer's filters as I haven't used them.
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