Many years ago, probably like 12 or so, I tried it once.
I hadn't realized at the time that mixing high doses of an MAOI with an SSRI can be pretty dangerous and I was on Prozac at the time so after I realized I through it out and never tried it again.
But the one time I did try it I took a bunch of capsules and felt very stimulated.
I know I was pretty high because my pupils were VERY dilated.
Actually I have heard it is also supposed to be mildly hallucinogenic on top of being a stimulant.
Anyways, as I remember it wasn't that great, just very stimulating and actually a little bit overwhelming in the type of effect.
Not like fun stimulating like Dexedrine or Kratom but kind of like "whoa, I'm going a little faster than I'd like"...even though I've done Coke and that was also more enjoyable and also more stimulating than Yohimbe.
I wouldn't really recommend it as anything all that great, but again, I only did it once so I don't have much experience with it.