even in model 2013, gps's oem still be better than garmin if you have some luxury car. For ex: bigger screen 10", voice control better, display on windshield, reverse camera, etc
for gps features only: garmin take out the detail of street name (maybe due to cpu limited). Garmin just tells you turn left on right or left on which street, which is in luxury car can show you exactly how to turn into or stand in which lane to turn left or right, even you can see double screen or triple screen how your car reach to that turn, oh..many features that Garmin cannot beat to it...
if you have bike, you really want to have zumo line which don't have any 3D lane or building...no fun anymore..overhere..there's some riders like to use plastic bags to cover or buy some option like waterproof case for nuvi lines...dissappointed..zumo line costs a lot when you know it too bad to have.
All good to have in car GPS till you get out and start walking around the city you don't know "Then what do you use huh"