I have connected the Varia 510 Radar-Light to both, the Edge 830 bike computer and to the Fenix 5. The vibration alarm of the Fenix is helpful, when the acoustical warnings of the Edge 830 regarding approaching cars are supressed by strong headwind. Unfortunately the vibration alerts of the Fenix 5 are extremly short in this configuration and I missed them very often. This is mainly a problem in connection with the Varia 510. E.g. for LAP counting or PACE limits, the vibration length and intensity is much better.
Is there a configuration possibility or an add-on to modify the vibration alarm, e.g. three strong vibrations of 1 second each?