I own Forerrunner 645 music. Creating a playlist is a pain in the (you-know-what)....in fact, I haven't figured out it yet. I tried googling but no luck.
whenever I use 'Garmin Espress -> Music', the "loading" part is so painful. I don't own any premium services and my music library is pretty huge.
there is no search feature. I have to add each and every songs individually. Since there is no play-list, I am stuck with one default playlist forever.
I bought the Music edition because I don't want to carry my phone. I still have to carry my phone for music till these days.