I have used this program. I purchased the 10$ per month one from att and then a few days later i installed mapquest navigator. I personaly prefer the mapquest for a few reasons.
1: has night mode colors
2: can pay per year at less than half the price
3: downloads all the info for the route so i can still use it while on a call
4: updates a lot faster than telenav/google
5: trafic info seems to work better
6: easier to get address entered into the system.
There are more reasons why i prefer the mapquest over the other 2 options. mapquest is defently better