If you’ve already read our review of the Defender Series Case for iPad 2, you’ll find this updated model very familiar, but it has been improved. There are still four pieces—a two-piece plastic frame, a rubber cover, and a plastic shield—however, the company has made quite a few changes to the overall design. It feels like a mostly refined take on the original, save for one key element. The heart of the case is still the two-piece…