There is basically none. This is from me going to MicroCenter, and having these two computers side-by-side. Anyone saying that the latter feels "much better" is only kidding themselves. The only difference is that it feels "cleaner" to press down on the button. The travel size is still the same, but unlike the slight wobble with the former, the latter's feels nicer. That's basically it. Nothing changed about the travel distance. In addition, as I stated in the last post, a relative of mine got his new MacBook Pro 13". I just wanted to write this post to make the comparison between the MBP and MB, since no one owns a MB.