ok ... here's the skinny on RX7 maintenance. sure, they require more than just driving it forever and not putting oil in it or anything foolish like that. the motors sound like go-karts because essentially, that's what they are. speed...for the displacement comparison, they're quick. never - EVER - put a twin turbo setup on a rotary motor. while they may have come like that from the factory, there's a reason the Japanese folks almost always took one of them off right away...they knew the motor would blow quickly like that. HOWEVER - i will say this - they're easier to work on than a traditional internal combustion motor. as long as you take the time to read up on them, they're VERY easy. i've been helping a friend of mine with his, and hell...my next car WILL be a rotary(possibly an RX2 if i can find one). they're more enjoyable than an i4 or v6
as far as reliability is concerned...the seals almost always blew after about 90k miles.
for the RX-8 - from what i hear, anyway - the seals are better made and won't blow as easily. i know a gentleman who bought his 8 last year out of the blue...and he's got no complaints yet. he said that he's never been happier with a car - especially since he can fit his standing bass in the backseat.
this might seem disjointed but that's how my mind's working right now.
ae86polishman - your best bet on an opinion of the car is to go to something like the RX7 or RX8 forums and read owners' opinions...the people around here are only going to have limited info.