One FYI on the 305 volume...I know quite a few people who have had the speakers gradually go quiet and have attributed it to the speaker holes becoming clogged with sweat and sunscreen and gunk. I have always worn my 305 over a wristband when I run to protect it from sweat and make it fit comfier on my wrist. It's 3 years old and the sound is still as loud as when it was new.