Competition and commoditization are driving hardware makers further into niche markets all the time, but this product is bordering on the absurd: a mouse for households with left- and right-handed people who share the same computer. It doesn't get much more esoteric than that.
With all due respect to ambidextrous families, is this really a burning necessity? We humbly suggest that R&D money might be better spent on other things, such as designing an injury-proof Wiimote. If you must have one of Elecom's "M-EKUR" dual-control mice, Electronista says it can be had for $22 in either neon green or orange. The lefties and righties can thumb-wrestle over which color you get.