So I signed up for a four session class ($385) at Seattle U about taking the GMAT. Worth every penny, as the instructor not only helped familiarize the oddities of this test [Data Sufficiency?!?] and identify which sections each student needed to work on, but was hilarious the whole time.
I took the test Monday afternoon - complete and official results won't be sent for a couple of weeks, but I unofficially got a 600 overall. So, better than average, but not amazingly so. Most of the points lost were in the Quantitative section. It's been far too long since I regularly factored quadratics.