Sorry I didn't get to you earlier in the day. That was my understanding, as well. It's a USB interface, for driving soft synths. I suspect you'll have tracking, or compatibility issues if your Mac or PC isn't running the most current OS, but otherwise, it's supposed to be very fast & accurate.
I'm a long-time MIDI Guitar user, just over twenty years. I used a GK-2a, for ten or twelve years, with no major issues - I used it on maybe half a dozen different guitars, over that time, with minor tweaks to the Pickup Sensitivity in my Roland GR-1 & GR-30,whenever I moved it to another guitar. When it came time to retire the GK-2a, I had epic difficulties with the GK-3, when I first got one, tracking, latency, re-triggering, virtually everything that can go wrong with a synth pup. Eventually, the local Roland rep gave me another GK-3, which worked within the first hour after I mounted it. I've been using it ever since, with some further adjustment to the Pickup Sens in the GR's.
My strong recommendation - get a Godin Freeway SA, when and if you can afford it. A high-quality hex pup system, in a high-quality guitar, you can't go wrong with it. It's a much better instrument & hex system than the Roland-ready Strats, no contest.