any ill after effects? coming down hard or felt heavily medicated after the 'thrill' wore off?
For me the after-effects were profoundly positive and lasted for weeks. It's currently being studied as a possible anti-depressant (the active molecule Salvinorin-A is, anyway). It's also the only known terpine-based hallucinogen and is active in microgram doses just like LSD.
Granted, as I mentioned in my trip reports I'm not sure if the therapeutic value of smoked Salvia comes from the experience itself or the fact that it ends! It can be that intense, and only Salvia and DMT have ever gotten me to the point where I could not tell if my eyes were open or not (even with the lights on...). My trips all lasted around 4-6 minutes (from blast-off to rediscovering I have something called a "body") but if someone had told me I'd been gone for 4-6 hours I would've believed them. The sheer volume of "content" that Salvia can pack into a 5 minute trip is truly astounding, and I have no trouble remembering everything I saw on those trips (which I also found surprising, considering "where" I went).
I should probably specify that the statements above only apply to smoking it. I've not yet tried the traditional method of chewing it yet, which is supposed to be a very different (and mellower, though longer) experience.
Incidentally, the people who've been using it as an entheogen for centuries in Mexico think people who smoke it are completely nuts for doing so. I also find it fascinating that (to my knowledge) no wild population of Salvia divinorum has been discovered (and people have been looking!). So far, it's only been found growing in gardens tended by shamans of local (Mesoamerican) tribes, which might be the only example of such on the planet.
For glow-sticks-and-glitter recreational party-trippers, Salvia is probably best avoided. For dedicated explorers of the outer reaches of inner space (or vice-versa, perhaps) who aren't averse to experiencing something that's potentially terrifying beyond words (e.g the Void) it's a very valuable tool to have in one's psychonautical toolbox.