When it first came out I went to an apple store and tried out a few of the mighty mice. I was not at all impressed. They were unresponsive, hard to click (had a squishy feel, if that makes sense), hard to scroll with, and generally one of the most frustrating mice I've ever used. But yesterday, while picking up my macbook from repair, I played with a few of the apple store's display units that had mighty mice, and I had a totally different experience. The mice seemed much firmer, all of the buttons were easy to operate, and the scroll wheel worked properly. All in all, a very satisfying and enjoyable mouse to use. I know there's never been an official update, but is it possible apple did something to the design since the initial release?