Like many, I've been looking to upgrade cameras. One of the cameras that I'm considering is often described as "a good back-up but not my first choice." (I'm assuming that a back-up is a spare that is used if something goes wrong with the first choice camera.) Why would someone use what they consider to be a second choice camera as a back-up. If it's not your first choice, why would you have it as a spare. On the other hand, if it's good enough as a back-up, why not use it as your first choice. I'm sure a lot of it has to do with cost, but that just doesn't seem logical to me from a professional stand-point.