I debated on using Telenav (The GPS software from Nextel) for the 7520 but decided to use the trial version on a run upstate this past weekend. Since then, I have been using it to walk around parts of town I am not familiar with and man, if I may say that having GPS at your fingertips can very well be the next big thing.
Pop in 'Bars and liquor' in your current location and it will sniff out nearly every single joint in your immediate vicinty and how to get there, distance, address and phoen also included. It also have a feature to find the cheapest gas station within a max of 15 miles radius. That's having true info at your fingertips.
upgrade! it's well worth it.