I've had the VV 54 Pro in my Strat (ash body, maple neck, 250K pots with a 330 picofarad treble bleed) for about 5 days now and here are my thoughts so far.
When played clean through a Fender Twin (or the Axe-FX's simulation of it), this pickups sound bright and clear, like a good Strat should, but it doesn't sound too thin. The bass and mids are there but they're not overpowering. When this pickup is combined with an Area 67 (in the middle position), it has that classic glassy Strat tone with just a little more oomph but not too much.
When played with slightly distorted sound (the Axe-FX model of a Marshall Plexi), the Strat characteristics come shining through. It's got that standard vintage Strat tone but again, it's not too thin nor is it too thick.
Finally, when the pedal is put to the metal and it's played through an Ibanez Tube Screamer and Mesa Triaxis (again, the Axe-FX's version of both), the pickup really screams. Please note that I'm using the Tube Screamer sim to not only boost the signal into the Triaxis but I'm also using it to shave off some of the high end as well as add a little midrange (3 dB at 638 Hz) to thicken things up.
Overall, I'm very happy with this pickup so far and I'd recommend it for anyone who wants classic Strat tones with a little more oomph. It's a great alternative to the Area 58 or Area 61.