True, the total cost including shipping needs to be factored -- then there is the smaller/better/faster factor.

That said, if you already own one and it was good enough a few years ago, is the smaller/better/faster factor a compelling reason to upgrade? Buying a piece of kit like a PLB you need to keep in mind it's a piece of gear you hope to never use, but if you do decide you need it, there's no room for error.