I had the same "23 tooth gears wear out quickly" discussion 15,000 miles ago. I've heard that from enough people that I believe it, but as of yet, it hasn't worn out.
I wasn't charged to have the gear installed, but considering how easy it is and how much business I had given the guy, I would be upset if I had been. I had the car tested after the instalation. It was within 3 mph up to 100 mph. That is well within stock tolerences.
I'll post it if anything changes, but as of now, the 23 tooth option looks good.
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