Losing signal is indicative of the GPS hardware losing signal of the satellites, not strava or mapmyrun.

But yes...I use Strava. My activities automatically sync up there, I can analyze my own efforts vs previous efforts, see where I stack up among the competition. It's a great app and widely-used even in a lower-population area such as where I live. There's not really a downside to using Strava - you use it how you want. You can make everything private so just you see the stats or leave it public for your peers to see your stuff. You can even make it so you have to approve followers, or it will abbreviate your last name to just in initial for some anonymity. There is a configurable safety zone to place on your maps around your house, or work, or wherever. It's a greap app - mapmyride is too, but Strava is the leader in that market as far as I'm concerned.