There's an old joke about Texans being nothing but a belt buckle and BS - wpEngine seems to have never bothered with the belt buckle. They are all hype, no delivery, and expect to both prevent you from engineering your own site and go in and muck with your code at the same time.

If you have ever developed and installed a WordPress site (I've been doing it continuously for 8+ years), you will discover the game they're playing very quickly. If not, you're in for a silent and over-priced reaming.