I had the "pure vintage" neck and middle, and whatever with the next-hottest version was for the bridge. At first they just didn't have much of anything, very low output and certainly no strat sparkle and chime. Put up right next to the strings, ridiculously, annoyingly close, and the output and tone got a bit better.
Guitar was a warmoth alder + maple neck /RW board strat with a 6 hole wilkinson trem, the good stuff. Not the most resonant, "alive" body I've had, which is one reason I sold it. Amp - at the time I had a vox ad30vt and a blackheart little giant head with a celestion V30 112 cab. I'm pretty much a straight-in guy, I am generally looking for a great version of a simple, vintagey sound with my gear.
Eventually I swapped the tone pots for no-loads and the volume pot for a 1 meg, and that did bring back a bit of the strat magic, but still not enough. They were just lacking in character, they sounded like cheap low-output pickups, I'm not sure what else to say. In that same guitar I tried Seymour duncan Cali 50s and the Dimarzios, and the dimarzios had by far the best tone of the three, regardless of noise canceling.
I'm not against GFS in general, I've used one of their tele bridge pickups (not memorable) and the A2 "pro" strat set, those were nice. But the neovins are the worst strat pickups I've had - I haven't been through dozens of sets of pickups like some guys, but I know what I like and those are not it.