No wonder the price is so low.Looks like it needs to be paired with a phone to do turn by turn navigation - that's a non starter for me. Wouldn't want to run down my phone battery on a super long ride to get the turn by turn - plugging a back up battery into my 510 is easy to do.
I just put it in my jersey pocket and turn off the main screen. Generally about 8% to 12% of the battery for a usual 20 to 30 mile ride. I am just an average cyclist and my goals are to make 100mi a week and to enjoy the process. I do look at Strava after I upload.I certainly like the idea of this, however I don't enjoy having my phone on my stem nor do i like having to keep it on all of the time in order to see my stats. Tried it, but can't do it.