In Cycling and running operation can be said: The GPS is significantly faster than other active watches. That will take at my Garmin 201 sometimes four times as long. On the treadmill, the clock measures incidentally surprisingly accurate.
The functions while swimming are nice: track counting, it resultuerend kilometer indication and calories. But since I have to say that the system does not work so great. But I can not give advice, why.
What I do not understand allersdings in the software, the exclusive fixation on outdoor activities is (aside from the treadmill). In my view, it would be no problem at all if TomTom software offers a program that only measures the heart rate and gives the calories on this basis. Through this indoor program could use the clock even during cardio exercise on a spinning bike or the Zumba. Love TomTom technician: Check it out, if you can not even implement such a reduced program. Then the clock would be much more useful, because it then in "My Sports" my complete sports evaluates. I currently use the overview of my activities on the Internet only somewhat limited because it does not reflect the indoor activities.