Agree! For those who use power meters, most of the phone apps fall short of being accurate. For anything else, I also think they outdo a stand alone GPS computer. But for some reason, the battery life issue always seems to come up. Battery life on phones were terrible when the cycling apps first came out because you had to keep the screen on to see your ride metrics. Power consumption on phones has become much better since then. Optimizing the apps on your phone to keep them from using resources in the background, when they aren't used, adds even more battery life to your phone. Keeping the screen turned off and using a display unit like the Wahoo RFLKT conserves even more battery life.

This weekend I did a three day, cross state ride from the east to west coast of Florida. I'm using an iPhone 6SE and have three BT devices/sensors attached, one of which is a RFLKT. Friday's ride was 60 miles and took 6.5 hours (including stopped time) to complete. My remaining battery life, without having to charge it during the ride, was 73%. Saturday and Sunday's ride were both 80 mile rides lasting 8 hours each. Remaining battery life, without charging, was 67% each day. So my question to those who say they need their phones for emergencies is, "Just how much battery life does someone need to make an emergency phone call?"