Comment by beggi

Anecdotal for sure, but I've been using Bluetooth headphones with my phone for couple of years now. Wouldn't go back. The connection almost never drop and there's no interference. There's no delay because the phone syncs all audio with the bluetooth headphones. I don't see noticable drop in iPhone's battery either. The only annoying thing I've noticed is that sometimes my headphones have run out of battery, but it's not a big deal for me at least.