Works great with DuoTrap S

All the data you could ever want.
Spring for the Elite version.
Works and BT pairs seamlessly with the Bontrager DuoTrap S for Trek bikes.
Love the details and compatibility with Google maps.
Highly accurate and updates continuously. Cadence screen is big goose eggs but it does calculate cadence in the summary and on the settings screen.
(Using iPhone 6+)

Mikel J M about Cyclemeter Cycling Tracker, v10.5.4