AEM EMS4 from MWR?

So I am prepping to turbo my GT this summer and I was considering the Apexi Power FC for an engine management system. I also saw another standalone option on Monkey Wrench Racing which was the AEM EMS4. Seems pretty solid so I wanted to know if anybody has had any experience with it? If so is it worth the extra $400 over the PFC? Thanks for any advice you can give.