The OP didn't ask about UTD, but enough people keep posting that Fundamentals and Essentials are "basically the same class", so I thought it worth pointing out that this is not true. UTD's Rec 2 is much closer to Fundies than Essentials is. Essentials does not cover nitrox (Rec 2 and Fundies do), Essentials doesn't cover things like shooting a bag (Red 2 and Fundies do), Essentials is only a couple of days long (Rec 2 and Fundies are usually four day classes). I'm sure Essentials is a great class; it just doesn't cover all that you get in a Fundamentals class.
But "ESSENTIALLY"...