Apple recommends using the 85watt with a Macbook Pro. I am considering purchasing a second one that I can leave at work without carring it around and I see some used 60watt macbook magsafes at good prices. Questions are: 1 - Will it work? 2 - If so, will it cause any problem? 3 - Has anyone tried using a 60w magsafe with their macbook pro's? if so, can you let me know how it works out for you? Most appreciated!