I recommend you get it. I'm planning in getting one myself. My friend has it on his 14 and to see all the settings he fiddle's with, i get jealous. Like having the dyno with you all the time and you can view all your previous runs and modify your air/fuel mapping after that. In another posts, there are 2 different PCIII. One is for the PCIII USB (part no 222-411) for normal road user and the PCIII USB EX (part no 222-411 EX) race prepped module which have been made legal for the road use.
i just got my pcIII installed with the akrapovic full system. I got it dyno tune and its running like a f**kIng champ!!!!. I'm not all that inclined in setting up the pcIII so, if you can get it done by the right professionals i think you would be just fine with just the pcIII and getting it dyno tune.