I can't speak for the RE050s, but the RE070s that come stock on the STi usually have a decent life, but as you get past that main-bulk area of tread and down near the wear bars you will start to get to that inner compound that is much harder and less grippy than the softer outer layers.
A great tire if it's available for the Z is the Dunlop D1 Star Spec tires. I've put about 25k miles on a set on my LGT and did about 20 track days before they had to be retired.
Price on the Dunlops is also GREAT.
-mike
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