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A well maintained rotary will not have reliability issues with apex seals. Most of the time, they don't last over 200k miles, but I've seen original engine cars with 300+ on them.
Apex seals fail due to oil starvation. The engine injects oil into the engine (purposely consuming crankcase oil) to lubricate them. I put a little 2 stroke oil in my gas to help. I've also heard it's good to redline them regularly because that helps burn off any carbon deposits - this is no problem for me.
My engine failed due to blown coolant seals. The previous owner seemed to think pure water is ok to use in the coolant system. Then my thermostat stuck closed and I didn't notice and it overheated.
Coolant seals seem to be a more common problem with the engines than apex seals.
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1988 rx7 convertible. Streetported, racing beat header and presilencer replacing all 3 catalytic converters. Atkins 6 port sleeves. K&N cone filter intake. 22mpg average, 27mpg max. Spreadsheet (updated regularly):
https://dl.dropbox.com/u/5310442/198...%20mileage.xls
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