Hey, didn't see your message until today today. Here's what I can say... The braces are awesome, huge improvement on a roadster, but you will not be able to use the 6 point on a daily basis. It's just too damn low. I have it sitting in my garage and use it only for track days. That being said, I highly recommend the other two, but as i put both the gt spec and nismo braces on the car at virtually the same time I can't say which had the bigger improvement. But I can say my roadster feels almost as stiff as a steel roof Z now. Turn in and suspension action mid corner is phenomenal. Slight regret on the 6 point as it's not streetable, no regrets on the other two or on the nismo set even though only 2 of the three nismo braces fit on the roadster.
If you haven't been on a track in this car yet, grab a set of 18s and some slicks and see what it can do. It's an awesome vehicle