G1 RX7s weren't particularly fast, but they sure were fun. A buddy had one in HS and even though it wasn't the fastest car he always managed to keep up. The sound was great too.
I think a projected $4-5M for a track-only racer, that you can't even take home with you, is pretty steep.
After driving the street version, I can say that it doesn't need any more power, grip, or anything else. The only thing I'd really change is the steering wheel (I prefer round) and the seating, which wasn't particularly comfortable and is mostly non-adjustable. However, as the rep pointed out, it wasn't tailored for me, but for someone ~5" shorter and 15kg lighter, and they say that makes all the difference in the world. It is the most clever interior I've ever seen though, it has exactly the things you need, in the places I'd want them, and nothing else. BUT, I did break the little Manettino switch on the one I was driving, you have to turn it all the way to the right and hold it for a second to turn off ESC, and I did that, but then I heard something "pop" inside and it stopped working. At least it was stuck in Sport mode w/ ESC and TC off, which is
exactly what you want in a $1.5M car, that isn't yours, on a public road. Right?