From a stress & heat standpoint, especially if you already have a router, isn't it better just to use a ATA as a ATA, not as a router to reduce the workload for the ATA system processor so it runs cooler and removes the additional data flow?
I realize it's designed for this, but my concern is longevity and trouble free operation as much as possible. It just seems as running two phone lines (almost never active at the same time) and a Broadband connection, especially when transferring large files, Internet or local, would be a strain.