I am sure by now you might know - yea I have six, 3 portable,1 mountain bike, to 2 driving (his & hers). two are retired. So as I sit here some updates are taking 10 minutes updating or replacing the North American Map 2012/4 Garmin required almost two hours. Repairs to the OS on the older ones are easy... The corrections are important to fix a multitude of issues. I noticed last week (I do 200 miles daily) that some roads were not findable and I had to open Google Earth to get a fix or correct a spelling mistake or two. it's well worth it. Some GPS are retired so its important to look up the model and set up an account with some companies... GPS that are older than 7 years might not be worth the trouble.