[quote name='WhatIsThatThing']Mad Catz is actually the official peripheral manufacturer for Harmonix now (as much as that fact scares me so), so yes, it is the official Rock Band 3 keyboard, created jointly by Mad Catz and Harmonix.[/QUOTE]
Check recent reviews of their products. It's well known that they've turned it around and now produce some great controllers. Some of the best, in fact.