I have an F3 that i have hand for 1,5 years now. I like it and it has served me well, except for the fact that it does not have FE-C or ANT+ FE support to connect it to my Concept Model D rowing machine.
There are threads at the F3 forum for people that have high wishes that it should be implemented, but no such luck.
Sad to see that none of the F5 models have FE-C or FE support either.
What are your thoughts about it, should they implement it? I would like so as the F5 will be my future replacement for my current F3 model (unless it survives until F6 is released).