I have no previous experience with nav traffic and I'm currently contemplating purchasing this service for our new GL. Pros/Cons?

 

I use Sirius traffic, but it is not real time. Traffic (major cities only) is part of Sirius package with a new GL - you have a 6 month free subscription, so it's a no brainer.

I understand real time may be possible on a W221 with a Telematics update.