Personally, I haven't found much difference between 5 & 5r1, but I don't consider myself a BackTrack expert either5r1 feels more stable & has some updated tools. The dev team doesn't just throw a new version out for the heck of it; if they rev it, there's a good reason.
As far as customizations, I don't do much...my usual procedure is to back up what I need, then wipe & reinstall a newer copy of BackTrack.


5r1 feels more stable & has some updated tools. The dev team doesn't just throw a new version out for the heck of it; if they rev it, there's a good reason. 