For what it's worth:
I have been using my Sandridge for months now and loving it. Then, at the Cup I got to mess around with the Race grip on the freeflow they had out on Demo. I spent a bit of time talking to the guys at the booth as well. Of all the electronic conversion grips out there I feel that the racegun is by far the most polished and closest to a finished package (excluding the sandridge of course as it's more than just a slap-on grip). I was impressed and perhaps even a little jealous. This thing could simply hum. AND it was a good chunk cheaper than my F5! So, all vanity aside, I was quite impressed, and I've been around the block with electros. Just when I thought nothing could compare to my "sandwich"!
I'm looking forward to seeing this "eye" kit they have. Aside from that and the necessity of a laptop computer, it seems like a great product. That's my take.