Translations are very important tools. Good translations are helpful. Bad ones not so. Study Bibles may be very helpful. Or they may be quite the opposite.
ESV is, as far as I know, a good translation. An ESV Study Bible is in preparation. It will very likely be used by very many. Dennis Johnson, Fuller Theological Seminary, is the study notes contributor to Revelation. Johnson is the author of Triumph of the Lamb: A Commentary on Revelation. Phillipsburg, New Jersey: P&R Publishing, 2001.
The Introduction to Revelation is available from the ESV Study Bible website: http://www.esvstudybible.org/images/excerpt-revelation-intro.pdf.
Here is a small sample:
What do you think about the introduction to Revelation? It would be nice to see your evaluation in the comments!