I'll get to see one this weekend up close (Whitby Motorcars Christmas party).
I have seen one in person. I had been very interested. One look and it just took me the wrong way. From the door back it just doesn't sit right with me.
I do think it will do what FFR is good at - go fast for less money. That is assuming you do it the way they intended, with a cheap used Vette and the kit. You could probably get away with a pretty potent track weapon for under 50k. The car makes documented downforce, and roll-down windows are a significant plus day to day.
Problem is, most people will spend much more than 50k. And then the final product - to me - just doesn't look right. It's kinda like a 911... it makes good sense, but if you are not a 911 guy, you are not a 911 guy.