I have a GC and I love it. My wife uses an Iphone with the Groundspeak application. Both are very accurate, but the Iphone does lock in a lot faster than the GC does. If you are wanting to get a good GPSr, then I would recommend that you stick with the Iphone for now and save up for a better GPSr....dont get me wrong - the GC is great, but is not going to offer you much more than you get with the Iphone (except durability and longer battery life)