Following the mid-2011 release of RightShift, an iPad 2 keyboard case that was substantially similar to OEM versions we've previously tested, Solid Line Products went back to the drawing board for an improved sequel. Behold RightShift 2 ($99), which has tweaked pretty much everything: the outside of the folio-style case is now a matte-finished rubber hex pattern, held closed with an elastic strap, while the inside contains a matching keyboard. Made…