+1 Elemnt love mine , never had a problem it works out the box from the start and like @PaulSB the bit's you don't want just turn them off. Only time you really need to connect your phone if that's not for you is to set up what into you want to see (though you can switch between stuff that what you want to see on the unit if you out a ride) the units you want use and to sync data to 3rd party site's or see your ride data in a bit more detail all from a simple to use app. it works just fine on a ride with out it being linked to it. (i use it like that most of the time) It's ant+ compatible a few 3rd partly sensors won't work check out the site it has a full list. Saying that if it come's to it the bundle is good value. I ended up getting one easy set up and fitting quality is good too I did have a small issues with the heart rate one but a new battery has fixed it.