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Rob,
I haven't used one, but they have a good reputation.
The real issue is the fiddle to keep the etalon tuned on band (stable temperature) and the fact that the "fastest" you'll get is around f30.
No full disk coverage on long focal length scopes.
The front aperture ERF - not sure it's a Baader D-ERF????
Certainly worth considering...
Which scope would you use it on??
EDIT: I see you mention the Vixen VC200 - what would be the maximum clear unobstructed aperture - 60mm or so?
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