No, I'm right on this one. The EX is part of their foundation collection, which means "basic" or beginner collection, strictly for freeride since most people don't start in the park. The SPi is part of the ATV collection, which means it's designed for a blended ride with freeride and park in mind.
I have the SPI's, but have never ridden the EX. I freeride almost exclusively. I find the SPI's are fairly stiff and they have nice long highbacks; qualities that I like for carving, but I would have thought would make them less desireable for park.