I am thinking of upgrading my FR645M to this watch as my old FR645M is unable to lock on GPS satellites anymore. I don't know why, the support center suggested me to replace it with FR245 with a discount which I am not interested in. However, as I scan towards the forum it seems that there are a lot of bugs also going on about this watch, some were caused by the good old story such as firmware updates effect! I found that sometimes updating the firmware will make your device go haywire (mine actually unable to lock on GPS ever since the automatic firmware updates)
I am not going to buy something and find out later that my watch has bugs on features that I hope to use everyday until it's broken. Cheers and thanks for anybody willing to share their their experience of using this new watch!