I've always used a mouse with my laptops, even with my previous Black Macbook. But now it's been 2 months since I got my unibody MB with its glass trackpad... and this time I never felt the need for a mouse. In fact, I find the trackpad more enjoyable to use than a mouse. I like the smoothness and responsiveness of the surface. To me this is the best achievement Apple has made through the unibody laptops.