THIS IS THE VERSION OF THE SOFTWARE I HAVE.I HAVE A SIEMENS SIMATIC S5 100U PLC(103 CPU)TO PRACTICE ON.IS IT WORTH ME SPENDING A LOT OF TIME LEARNING TO USE THIS SOFTWARE IF I INTEND TO BECOME FAMILIAR WITH SIEMENS?WILL IT ALSO BE OF BENEFIT TO ME WHEN USING THE LATEST SOFTWARE(INCIDENTALLY WHAT...