Anyone here use the garmin 620 and have feedback on it? currently have the 310xt and it works pretty well. Like the reading on the 620 when it comes to battery life, other than I wish in training mode it had more time, but looks like it could be worn like a regular watch as well. ??? the cadence and other stuff might be cool too as well as the smaller size, but none of that matters if it doesn't get the basic info I want (mileage, pace....).