You dont have to use a universal solenoid like the GM to get it to work. If you can find someone selling a solenoid off a greddy, AVC-R, etc they will work.
My greddy profec S will not make more than 26psi, however I installed a manual BC and Im at 30psi right now. I have triple checked the EBC was hooked up correctly. I believe it is the MAP sensor built into the EBC thats my limitation. I plan on just hooking the solenoid up from the EBC, directly to the AEM.
FWIW, I enjoy my AEM EMS also. I had some issues with it when it was exposed in the engine bay, but after moving it back into the cabin, it seems alot more happy. I have controlled my nitrous system with it, and I am constantly changing the 2-step at the drag strip, as well as making logs.
The Aem Log software is incredibly easy to use and useful