Here at Benchmark Reviews, we?ve tested several AZIO keyboards and been impressed with the quality of their construction and the bang for the buck they offer. So when AZIO offered us the chance to take a look at a prototype of their project ?MK Retro Pro? keyboard, we jumped at the chance? even though a retail version of this product is some months in the future. An evolution of AZIO's existing ?MK Retro? typewriter-themed keyboards, later renamed Retro Classic, ups the ante with a new design and new features.