I didn't expect more from my VMC than faint fuzzy observing, and paid accordingly -- used vs. new. I don't doubt that there are used C8s that'll out-perform it on lunar / planetary. I'm fine with that. I have my APM 152ED for ultra-sharp lunar / planetary observing.
IME, $350 for a used VMC would be a very good deal indeed! I paid a bit more than that, but y'all, I can "galaxy sweep" with mine the way I "cluster sweep" with my APM 152 or RV-6 -- and that's in town. In the winter, in the country, I can foresee many happy nights with my VMC cruising along on my Tak EM-1S (with battery pack!).
Mine can't beat my APM 152 on the average planetary night at The Swamp. But it's not too far behind. And the views are bright, and the belt colors are vibrant -- it's a scope where I have to amp-up the magnification so that the disk's brilliance doesn't overwhelm the fine details (almost opposite to a large refractor).
Again, NO WAY would I pay new prices for a VMC (sorry Vixen!). A C8 is a safer bet for most folks. But if you prefer more refractor-like views, it is a Mak. If you have dewing problems on SCT correctors, it doesn't have one. If you've experienced mirror slip, the focuser is independent of the primary, so no slip, no slop. OTOH, if Newt vanes distract you, you're probably not gonna like it. Back in the old days, companies sold optical windows for reflectors, so it's a preference that goes back decades -- at least!