Last week I did the ECU Reset on my ST1300 with 155,000km on it, before a 600km round trip to the Riverland. The reset went smoothly with no problems, and I report that I can't really notice any difference in idle, overall smoothness or power. There may be a 0.25 l/100km improvement in fuel consumption, which is too little to be able to firmly attribute to the reset, and could easily be right hand, weather, speed, road conditions, or how I was holding my tongue.