I have 3 systems all 4.5T, i have only had a problem so far with one system which was fairly new and the speedo lost throttle so i warranted it. I received a new speedo back within 3 days only to use it again and within 30minutes it caught fire so i warranted it again and have just recieved it back from Horizon this morning with a report stating that if the system is used with a 2s lipo batteries the motor timing isn`t supposed to be set above normal as the 4.5t is a hot fast motor.
As already stated i think every manufacture has issues,but i am extremely happy with Horizons customer service and have not let this put me off there products, i also find the losi xcelorin system well priced and extremely competitive, but my experience is quite limited with brushless systems i just thought i`d share this with you.
Andy
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