Absolutely still relevant for those that don't want or can't use a cloud backup and want/need the convenience of a tape-like cartridge function. Which means primarily the smaller side of the SMB realm. Otherwise, for easy and frequent physical movement of data from one location to another. The cartridges are pretty robust, a helluva lot tougher than your generic 2.5" USB drive.
thanks for the heads up, i will try to find this stuff a good home rather than allowing it to land in the dumpster. one kind of odd item is a rack mount 12 RDX drive chassis. looks to connect to a host with either eSata or eSAS, cant tell till i pull the cable at the end of the month.