I have a unibody macbook pro. I have heard that using a trackpad is not recommended because it could cause finger soreness and potentially lead to arthritis. I'm not sure how legitimate this concern is in the first place but I can attest to the fact that trackpads can lead to mildly sore fingers after a while. Now with the macbook pro, I love the trackpad and even prefer it to a mouse. The gestures (especially with BetterTouchTool) are so convenient that it would be worse to move back to a mouse, but I don't want to put myself at getting arthritis in the future by using the trackpad. Any opinions?