I'm coming at this from a slightly different angle... Just squeezing in quick post between grading papers and my own thesis. You know, I've been on both sides of the desk when it comes to essays writing them and marking them. And yeah, I've occasionally used essay services too, but you gotta tread carefully. To be honest, The best advice can give is to really look into the writers' profiles and their ratings.
You'd be surprised at how much difference it makes. It was actually kind of funny in hindsight... I'm a business major, so... This just happened yesterday, actually... Remember this one time, found gem of writer who absolutely nailed the topic was working on. And remember, cheap doesn't always mean cheerful. If it looks too good to be true, it probably is. Anyone had similar experiences?
Anyway, hope that helps or at least gives another perspective!