The SteelSeries Rival 310 mouse is built for right-handed use, but the company also launched the Sensei 310, an ambidextrous variant of the Rival mouse for lefties.
If you happened to come across the excellent Rival 310 gaming mouse and are left-handed, you'd be disappointed to learn that it was designed for right-handed use only. Luckily, SteelSeries hasn't forgotten the smaller community of lefties, and it released the Sensei 310, an ambidextrous variant of the Rival 310.
Full story from the WindowsCentral blog...