I tried several GPS apps like GPS Kit, MotionX-GPS, etc and I believe this is the best one for hiking, backpacking, mountaineering...my main criteria is the quality of maps. All of these apps have to buy licenses to get the maps and iHike uses USGS and US State Forest maps which none of the other apps use and the topo maps lines are a lot more clear for me to understand. Regarding app navigation I find all the apps not very intuitive and iHike is not exception in this regard but with a little bit of practice & reading the help, I can find my way around just fine. I did a GPX import and the track and way points imported without issues. Overall, its an awesome app.
Mcbbcn about iHikeGPS : Classic Topo Maps, v4.6