I'm coming from a garmin 305 and am looking at using the AW for times when it's not convenient to have both (eg. while traveling). How does the iSmoothRun app compare to other apps like Runkeeper or Strava? In looking at their website, they state "For the moment Apple is very restrictive regarding what features of the watch we can use. This will hopefully change in the future and we’ll be able to use its HRM, vibrations and buttons." I'm not sure what that means. Is it the delay in displaying info, the lagging HR, or similar items that that other apps suffer? Since they don't offer a lite or free version, I'd like to get other's opinions before plunking down cash.