I found an interesting page on the ESV's website. It gives a quick overview of the two dominant translation theories, and then it discusses various translations and how they compare to the ESV. Naturally, they leave the distinct impression that the ESV is the best translation ever, but it is their website after all. :-) Nevertheless they do an accurate job of representing the different translations. If you're interested in various Bible translations, take a look:
For it's worth, I use ESV during my study time, although the NASB is my preferred study translation. The ESV is a fine translation, and IMHO it would be especially good for someone who was raised in the KJV tradition but is looking for a newer and more accurate translation.