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Well... I have just bought an 8" f/8 mirror which is 1/21 wave (0.995 strehl) to make a lightweight planetary scope (dob) that should easily give any of these refractors up to 150mm aperture a run for their money, with a small secondary, curved vane spider and proper thought given to keeping stray light out. A project to build this winter in tie for spring/summer, I hope.
I also have had the opportunity some years ago to use both two Quester 3.5" and a Questar 7. While the small 3.5" Questers definitely are essentially perfect in every imaginable way and perform better than many would expect, I was somewhat underwhelmed by the Q7. Good, but if I was going to spend that amount on a scope I think I'd buy something else.
Incidentally if you ARE after a Mak for lunar & planetary I'd suggest instead you consider:
a) One of the scopes from APM in Germany assembled using russian optics; not only does APM offer the usual choices of aperture and focal ratio but you can also specify the quality of the optics (yes it costs more) or settle for the bog standard russian grade. And APM build a far better tube than Intes does.
b) A Maksutov-newtonian, there are several cheap commercial ones at 190mm aperture around f/5-6.
c) And if thats not enough, APM will assemble a custom Maksutov Newtonian to your specs.
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