Nice, that has not been my experience but the last time I've tried was months ago. All of my Mapmyride activities, once exported and then imported onto Strava, showed up as routes only, no speed or time info at all. A Google search at the time suggested that that was a common problem regarding Mapmyride but if they have fixed it, then all is well. I ended up re-discovering my old Garmin Connect account and just exported my GPX files from there and imported them onto Strava.