Used my TB along side my Garmin 765 with precomputed route on a 5+hrs trip. Out side of one turn the route picked by Google Navigation was identical to my precomputed route on the 765. The TB worked flawlessly for 99% of the trip. It never lost signal from the Satellites and was accurate with all details and was quick to come up with a re-route if necessary. With about 19 miles to go the TB "forced close" due to an error. I was a little disappointed in that action, however, overall I am very well pleased. The error may have been the result of sitting on the dash in the sun for an excess of 5 hours. Now with the TB I will not hesitate to travel without the GPS and use the TB if I need directions.
I am still 
with the TB but still have my own quirks on the operation of the TB. I have been very lucky with this phone.