I've had the Magellan Sport Topo and the Platinum granted the Magellan is easier to program but I find the Garmin 60cs much more reliable in my finds. So much I gave away my Topo away because it wasn't even close. Even sent it back to the factory for a recheck but not much better. They say Magellan is better in the mountains for reception....maybe so but after spending a lot of money on Magellan I think I've grown roots for the Garmin. It works best for me and my wife can program it also and she loves it. Don't know much on the Explorist 600 but I'm always looking!