I don't use the Bolt but use the Elemnt. My results from the Elemnt:
1) The Elemnt tracks the distance very well.
2) Live tracking works good. My wife gets an email with a link to the ride which shows a map with my location.
3) I have 20,300 miles on my Elemnt. In that time I can only remember 2 times the gps did not record a portion of those rides.
You only need the head unit and I use a speed sensor and cadence sensor.