Let me save you a few hours (although I urge you to research it more). I researched it and found the following (I am getting it done later, and the following is paraphrased):
-It made a nice improvement. A couple of people thought it would only be incremental, but were blown away by how big of a leap (relatively, of course) it was.
-Everything is clearer. That was one of the only things that I remember the reviewer agreeing on. Some said bass was better by a fator of x, some said treble by a factor of y, some said sound stage, but everyone agreed that it was more transparent and clearer after the mod.
-Get a Vcap dock with it to get best SQ. Otherwise, sacrifice some SQ to remain somewhat more portable.
-Get the nicest IEMs or headphones you can afford to match it
-Get the nicest amp you can afford
-It will never be a real home setup, but it will give all but the high tier a nice run for their money
Hope that paraphrasing helps,
Nkk (looking to mod his 5.5g at the end of the school year)