T3/
T4 is not compatible with
Training Manager as it only stores summary results.
I own T3C,
T4, and
T6 and would recommend buying T3C with Firstbeat Athlete software that Firstbeat sells online. Firstbeat Athlete is basically the PC version of the "coach" feature in the
T4 and is far easier to use on a PC than on a watch and supports
T3,
T4, and
T6.
Now if you really want all the data of a
T6, I would suggest waiting for a T6C as it will add a comfort belts, cadence
pod support, and real time train effect measurements.