Anyone who is reasonably competent can learn either or both methods.
As for using it in the AvA, well Rolex nailed it. If you have a slightly spiking stick, your going to have fits with the manual method.
Its been used often in FSO, usually with an attendant flurry of requests to setup the TA so people can practice it.
(gets to be a pain in the posterior for trainers)
Personally I liked it, as there were a couple of things you could do with it once mastered, that are not as easy with the other.