I installed the app on my Motorola Droid Razr and love it. I've looked at several phone GPS apps over the years, and this one is by far the best. The interface is not complicated at all and the app operates smoothly. Waypoint setting and finding is unbelievably accurate. I walked from my kitchen to the master bedroom with the trail recorder on and when I viewed my trail on the aerial view map it was exactly correct showing my trail inside the house (scary). It has an accurate odometer which surprisingly does not loose accuracy at low speeds (a problem I've had with other GPS apps). The waypoint finding compass is fantastic and really does always point to my target, not just a static offset from north seen with other GPS devices. I also like the fact that the data is protected from power loss. I carry a couple of extra batteries with me when hiking and I know I can change the battery mid-trail without losing my accumulated data. Great app!