Boox has refreshed another model in its lineup, the Boox Go 10.3, adding one new optional feature while, somewhat disappointingly, removing something users really liked. Boox is back at it again with the lineup refresh. This time, we're taking a look at the second-gen iteration of the Boox Go 10.3 , Boox's iPad Air -sized e-ink tablet. The Boox Go 10.3 is, as the name suggests, a tablet that is 10.3" on the diagonal. That gives it just a little bit less screen real estate than the 11-inch iPad Air. Boox has really nailed down the design of many of its e-readers, and the Go is no exception. It's thin, but doesn't feel fragile, so you'll be more likely to toss it in your bag. Like many of Boox's offerings, it also features a dedicated thumb-rest area on one side. I appreciate this, specifically because one of my main gripes with reading on the iPad is that it doesn't really give you a good place to grip. In addition to the tablet itself, you also receive a folio-style case.…