This is not just a pickup but it also contains the controller for the Fishman HSH and HSS systems, that means those can't be done without this one. For HSH you need a pair of Fishman active humbuckers, for HSS you need the other Fishman single coil SSP for the neck, these only work in pair, you need one of each.
I got this one out of curiosity, to combine it with a pair of Fluence Classics I had laying around. It was also a kind of a soldering test for me because the circuit is very complicated, it ever requires a Fender SuperSwitch, plus 2 push-pull pots to activate all the 3 voices available.
Well, once all was installed, this 5 positions system with 3 voices for the positions 1 and 5 is absolutely mindblowing, tones are great and go from classic Strat to full shred metal...
I would clearly recommend this for anyone interested in upgrading a HSS or HSH guitar to an active system....