I did it solely for roleplay reasons. I'm enjoying it for those same roleplaying reasons, and will one day chronicle all of it diary style. (I've got the raw notes, just haven't bothered doing the blog.)
That being said, I'm not sure if I'll do it again. I like being able to loot things. I like being able to use my map screen. I also would have liked to be able to revert on cue once I got the ring. I'm a console user, so barring a major change of mechanics via either a mega patch (bloody unlikely) or something creative DLC-wise, I'm kind of stuck.
The sole character I have may or may not cure herself. She's very torn right now on which way is the right way to go. She loves the power, and to a degree the wild abandoned bloodlust...but she's worried that she's losing a piece of herself to the beast. Plus..Sovngarde. That one's eating at her pretty bad, considering she was a secret Talos worshipper before finally crossing the border into Skyrim.