Honestly, I made a decision and bought the Tracer in about two weeks. I read a lot of reviews and owner feedbacks in that short period of time, but I haven't seen many with very high mileage. The only high mileage review I found was about a german owner who rode it for 120.000 km/ 75.000 miles and it was almost problem free (some injection problem after the 40k km/24k miles big service and the gear indicator doesn't always shows the 4th and 6th gear).
I read about the tight exhaust valves and I was thinking checking them in the near future. I still have a few miles left (I'm around 32k km/20k miles mark) but I don't see any problem about servicing them sooner.
I think there are maybe a couple in all North America (if I remember correctly, I saw on Advrider Forum a long time ago somebody imported one in the US), but in Europe they are very popular, mainly in the UK, Italy and Greece. Even the France law enforcements still use it.