I think I attained threshold level 4/5
I filled my lungs with the 20x extract, and was immediately elevated to a higher state. Friends that tried before me, were laughing histerically after smoking, but i noticed the less experienced were a bit scared, and didn't inhale everything.
So i thought this extract was weaker than it actually was.
And oh my, was it ever potent..
I took a long drag, like i would from some nice herb, and reclined in my chair. As i said, it immediately kicked in. The people around me were smoking bongs, drinking, laughing generally having fun (we rented a cabin in the Ardennes).
At first i couldn't see a thing, i thought i was going blind for a moment, but i had my eyes closed :upsidedow. Then the bunch of friends appeared again, although severely altered in form. They were a blob of happiness, they melted together, or merged, that might be a better description. Their color scheme changed continually.
This multi-color presence of laughter and exstatic behaviour now began to have a face, and it seemed to talk to me.
In this one face of colorful blob, i could recognize every face of every friend i had ever known. I felt a great social coherence, and it was beautiful. Really one of those life-altering experiences.

I've had other, a few pretty scary ones, like witches flying around me, and i once paralized my two legs.
Just like peyote and Devil's Herb, salvia is a playful Goddess. She'll make you see heaven and hell at the same time..