In terms of physical hardware changes, you can pick from a great laser sensor or an even-better IR LED sensor. Once you've got those figured out, you can swap left and right mouse button switches and you are good for at least 70 million clicks. It's a great feature to have and it eliminates SKUs for EpicGear to try and market. You get everything you need and more and while it's not a budget priced mouse, you are getting a lot for the price...
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips