I LOVE the trackpad on my new unibody MBP, it is much better than the older trackpad on my 2007 MBP. I love the sensitivity and size of it. In fact, it is better without the button. It is more sensitive to taps. But if you're used to moving the pointer with your finger and tapping the button with your thumb, you can still do that and click with your thumb. But, you can even click with your thumb with just a tap of your thumb and not actually having to activate the physical click, thus using less pressure.