Military Miniatures in Review (MMIR) is one of only about a half-dozen high-end armor-based magazines, and my favorite go-to source for finishing and weathering armor models and figures. Regular publication has been spotty in the past; otherwise I would have sprung for a subscription long ago. That said, I try to pick up every new issue, and those that I miss I can purchase (at a discount) from their website.
As of right now, Ampersand does not offer MMIR in digital format, but even if it did I’m not sure I’d switch from the hardcopy version. The quality of the materials used and the sheer number of crystal-sharp images included in each issue makes these magazines stand out among their peers.