I love the weight, feel and look of the Pro mouse. I also like that it tracks more accurately over many surfaces than a ball mouse. I also like the way the teardrop feels in my hand, even if it does seem a bit delicate and flimsy but I would love to see the internals of the Pro in the teardrop with maybe a weight added to give it some heft. I don't know how the writer of this got the Pro mouse open, though, as it does seem to me to be epoxied or maybe sonically welded together and hard to open without damaging it. I also wonder if a USB mouse can be adapted to ADB.