Listen to Merlin...

Also having power allows you to broaden your search for a coach, if you so desire one...

My coach, for example, is on California...I am in Ontario Canada...He gets my power data daily and modifies my training regime based on those numbers...

I have been using power for about 18 months now and I have seen steady improvement....Nothing earth shattering, but I know I am a stronger rider then before...And yes I highly doubt I would be in the same place if it wasn't for the power meter and having a coach who understands my specific situation....