I have been using the 315 for 5 or 6 day a week for a few years now and it works flawlessly. My co workers all use Garmins 12, 76's and Rino's, however I would not trade any of them. I had to pay $50.00 for a data cable and wait a couple of months from crappie tire. It must of came by way of dog sled. If your not after a base map this unit works very well. Don't go in the woods with out a compass .... happens.