The trick to Pantheon's ult

The trick to Pantheon's ult

Pantheon's ult, if used improperly, is life threatening to say the least.
I've had a lot of issues with it. One being it is only effective 5% of the
time. The other is that it can be interrupted, when interrupted a 8 second
cooldown comes up, then it resets the cooldown completely (atleast it
appears that way) and, timing the ult with such a long channeling time.
Typically, the only time I've had it be really effective is when I
communicate with another lane to CC the opponent as im jumping on top of
them. Otherwise I'll ult on top of someone and if I do it right they might
use all their escapes to get away from it, which is good I guess.
Things I've learned not to do is chase with it, or jumping on top of a
turret with 2 or more opponents trying to take it or tower diving with it.
Has anyone come across some tricks that let you actually get good use out
of it?