I began to use it with much frequency in the later part of March beginning of April along with other members of my family. It has over 250 miles on it as of 09/11.
From the beginning there were issues. There is a lot of vibration on the deck, when initiating a manual workout; it would not always start. It was necessary to restart to actually get the belt to start moving. The incline would not always go to the selected height or it tended to drift down. Finally, it began to hesitate while running and it smelled like there was an electrical short.
Needless to say, those are the problems I can remember. For the cost and considering the reviews I read on the Trailrunner 4.0, I was very disappointed.