FYI, after purchasing the traffic add-on, I am extremely disappointed. I find that it did not know of multiple traffic slowdowns on my route home today, though after disabling it and restarting the GPS so that it would connect to FM traffic, it knew of them immediately. I confirmed that this was not just a product of the extra time during the reboot by reconnecting it to the smartphone link traffic and noting that they were still not there!
I'm not talking about the new HD radio traffic, either. I am talking the base GTM 35 receiver that came with my 2595LMT (standard FM-rds traffic). One thing I have noticed is that the smartphone link traffic has a bit more detail (when there is an incident showing traffic congestion, it will show the speed of traffic whereas the FM traffic will not), but this is hardly useful when it misses incidents entirely or is extremely delayed.