As long as I have been a runner the Timex Ironman watches have been all I have used.  I used this watch for almost a year and it did everything it was supposed to do.  The only issue I have had with the watch is the Start/Split button has become a little harder to press over time plus the design of the button is somewhat sleek and molds with the face of the watch.  It's made more challenging to push the button wearing gloves in the cold weather.  It's caused me to not be able to accurately capture my splits a few times when running my intervals.  I'm sticking with Timex though, I just ordered T5K413 model which has a larger more prominent Start/Split button.