I've had this for just over a year now. When it was new it wold recharge the phone quickly form 20% back up to 100%, now it recharges the phone slowly and only up to approx 80%. Will it last another year, I do not know, but in the last year it has only been required less than 12 times.
What an amazing book. I have never read a book so fast and learnt so much from it's contents. Twyla's style is easy and accessible and the information is perfect for any creative person. Buy and absorb you will not regret it.