I did install the PRS+ for my 650, and the process was incredibly simple. I did change back to the original firmware, however. I didn't find that there was anything that PRS+ (while wonderful) did for me that the original firmware didn't. I only load my books through Calibre, so the nested folders wasn't an issue for me, I can't be bothered to change the font, so that was moot as well.
Despite my own lack of use for PRS+, it's fantastic for those who would like the features it provides. Give it a shot, and if you don't need those features, restore the original firmware. Nothing simpler.
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