Well, good news is you can use the TIR-5 software with your TIR-4 (vector enabled) hardware. No reason to upgrade hardware, really. For AH2, I don't see the extra resolution of the new TIR hardware making any difference. And the software seems to be an upgrade to the config editor, again nothing you really need unless you have the new hardware or are one of those "I gotta be first to get this new widget no matter the cost or if I really need it."