I'm using American Vintage heads on my 1950s Slingerlands. Same heads as the Modern Vintage, but the American Vintage flesh hoops are sized just a little bit bigger to fit older shells.
They're a medium weight single-ply coated head. It's just that the coating is thicker than what you'd find on the equivalent "regular" coated head like an Aquarian Texture Coated or Remo Ambassador.
They do have kind of a "rubbery" feeling when played, seemingly dampening the stick's rebound a little bit. That effect seems to lessen a bit over time. Not that it's a bad feel, just a little bit different.
There's plenty of "grit" in the coating, giving them a rough surface that really makes brushes speak up.
Overall, I like them. They sound good on my old drums and seem like they'll last a LONG time. The coating seems super tough.
I'm aware this discussion is about Aquarian Modern Vintage heads, which I purchased for, but was unable to use on my '58 Slingerlands, as I couldn't get them to seat properly. Like Skydog, I tried American Vintage heads and noticed a dramatic improvement in tone and resonance. From my "Restored '58 Slingerland RK Kit" thread, here's what American Vintage heads sound like on '50s Slingerlands, tuned up tight. 12" tom has a thin head; the rest of the heads are medium. Remo ambassadors on all reso sides.
I'm not trying to hijack this thread; thought the following might be useful information in this discussion: