Originally Posted by grahny
No they don't help to improve your training. Your training program and sticking to it will help you improve. A power meter is a better measure to show actual improvement.
I use a 305 'cause it's a fun toy and I got a good deal on it. I don't race. I'm not training for anything. I just like riding and collecting useless data to look at later. It keeps me entertained
that and I HATE wires. so zero wires, GPS signal for tracking movement, HR because at some point knowing that and my cadence might become useful.