My bro was a Rotary guy himself. He 1st gen and 2 FC's. 1st FC got crashed. 1st gen was sold. AND the other FC we still have. RX-7 CAN be problamtic. It just depends on the overall condition of the car, but also the extent MAINTANANCE. The earlier FC's had a few bugs in them, but were taken care of in the later FC's. As for FD's, I'm not to sure of. My friend's FD had a problem with his vacuum lines and turbo lag.
Now there is a 1988 10th Anniversary Edition FC with blown Apex Seals in front of my house.....that I AM SELLING. For pics and info, click here:
http://hometown.aol.com/djkanekz/rx7.html