I heard such great reviews about the ESV Study Bible that I went out and bought it as soon as I decided I needed a study bible; honestly, I regret this choice, because it's... well, crazy.
In Exodus, it claims that a lack of evidence isn't remotely telling and that Exodus is still literally true anyway; in its forward, the author of said forward claims that the enlightenment and the Renaissance were bad things (this is one of the stupidest things a person can possibly say.). It's got a lot of great maps, but doesn't pay much attention to the historicity of Biblical texts or evidence for such, preferring tradition over the analysis of hard facts and relevant extrabiblical data.
So no, I'm not really a fan of it, and I mostly keep it around so that I have a Bible to reference when discussing the Bible with the crazy conservative people in my area (emphasis on 'crazy'; non-crazy Christian conservatives don't think stuff like that the NIV is evil because it doesn't say enough bad things about abortion, basically.).