Mine just recently rolled up 341,000 miles with only minor maintenance type items. Unfortunately it is now running rough and has low compression in cyl #5. I am debating whether it is worth pulling the head for a valve job or not - not sure I want to invest that much time and money at this point - it has absolutely no resale value.
Pretty impressive mileage..what do you have? (Trailblazer or Envoy)