I've been lucky enough to as a completely ordinary punter (member of the audience or whatever) attended weekend teachings by Ringu Tulku Rinpoche and Sogyal Rinpoche, and by coincidence ended up at dinner beside the Ven Panchen Otrul Rinpoche.

I'm a cynical old git, but even to me they all to varying degrees transmitted. As do some of the senior teachers in the Shambhala organisation I've met. Its not blindingly obvious, more like you find yourself sliding into a particular state of mind when they are around.

There tends to be a lightness of vibe, a direct connection, an easy humour and some sort of grounding or  centering effect. Mixed with a quickness of intellect, and a sense of power and total directness.

It's not universal  - I've met one or two senior teachers (never a Rinpoche) who were more ordinary, or at least if they were not i was on the wrong wavelength.....