What Garmin didn't tell us when they announced the nuvi 7x5 series and the latest nuvi 2x5 models, is that the lifetime traffic feature would be ad-supported. PC Magazine got hold of a nuvi 755T to review and had this to say:
"One gripe: The nüvi 755T comes with advertisements. My evaluation unit arrived with three preloaded vendors (BP, Walgreens, and Wells Fargo). When you access the traffic menu, one of these advertiser's names always appears at the bottom of the screen. Also, from time to time, one of these ads will pop up on the map view screen (they won't appear when you are in motion). A single tap of the advertisers' name will perform a POI search for nearby retail locations. Unfortunately, you can't disable these ads, but it's likely that they help Garmin offset the cost of the live traffic information that it offers free."
I should note that, in spite of this, they were quite impressed with the unit and gave it their Editor's Choice award.
Thanks to Sarit for the tip.