Grant's Grunts has posted a review of National Geographic TOPO! for Macs in which they go over the pluses and minuses of the product. Their review seems pretty much on target with one exception. And I have to preface this by saying that I haven't tried the Mac version, but... In the Windows version, you don't have to switch tools when drawing a route. When the cursor gets near the edge of the screen, it automatically repositions you.