I just tried it for the first time, just took a small dose.
I got severely confused, and as i watched a train go by it turned into a bunch of sticks, then everything went 2D and then it was over. After that I felt generally confused, and my depth perception was kind of weird, felt somewhat like i was in a video game.
Salvia didn't make me feel "high" at all, just really confused me and stunned me for a short time. Quite an experience though. I can't imagine what it would be like if I took a large dosage, and I don't intend to until I'm completely ready.
Just be warned, it's no party drug. Treat it with respect and be prepared.