We've seen plenty of gaming mice with adjustable DPI and swappable weights, but the new Cyborg Rat
lineup from Mad Catz is truly stunning. The mouse is adjustable in almost every dimension and angle, thanks to certain sliding aspects, some hex key-adjustable mechanisms and buttons galore (including a very useful aiming button for slowing down the cursor in those heated sniper moments). The real winner is the Rat 9, which is wireless and has a nifty little "home base" that continuously charges a hot-swappable replacement AA battery and keeps some extra weights warm as well, though with a $130 pricetag it's not for the faint of heart.
Mad Catz Cyborg Rat hands-on