Both are excellent choices. But from our experience, the customer base for each amp is vastly different. The guys who are after top end/elite level performance, with the best bits and efficient design while not really caring about total wattage or sheer SPL numbers will lean towards the ZED.
The SPL/very high output customers that want a very solid proven amplifier, who care about numbers and sheer wattage, lean towards the IA. I can say that not a single unit has come back from either model in all the years of selling ZED or Incriminator.
So what I am getting at is that it is a win win, product wise, but maybe you want to refine your needs or goals before you order. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif