I've got probably about 5 of these.....none of which found a permanent home in pickups until now.
I've got a Hagstom Viking which I just put my Handwound Zhangbuckers into. They had an A2 in the bridge and an A3 in the neck. It sounded pretty good, but something was missing...maybe some zing from extra output.
I tried to find my A4's, but they must be in pickups, so the UOA5 was the next best. It seemed like that was the answer. The bridge has a bit more output and drive, but not more harsh treble. The neck has enough mids and highs but not too much bass.
Its the first time where this particular magnet has worked for me.