Engadget’s Chris Ziegler has reviewed Sprint’s Epic 4G, the second 4G phone, and the first with a physical keyboard. It’s based on Samsung’s Galaxy S platform, also available in various forms–but not with a keyboard–from other carriers. He pretty much raves about the thing. Engadget got close four hours of life using the Epic as a 4G hotspot, which sounds impressive; it hasn’t done traditional battery testing yet, though. (Iffy battery life is the biggest gotcha with Sprint’s EVO 4G, so it’s an important point.)