Lol, apart from you putting a spoiler in the title
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I have become a Werewolf and it doesn't have many pros or cons really. The only real con being is that you can't get a rested bonus from sleeping.
Werewolf combat is very... buggy? If you shift during mid fight it takes around a 5 second animation for your character to have "turned", by that time your enemy has already beaten the sh*t out of you. Which to me doesn't make sense, they should slow down the time or something, or cut scene whilst he changes, so that you don't lose any combat time. Otherwise you have to shift before combat, which is kinda annoying because I like to open up in sneak with a few arrows to take them down a little bit before melee.
There's also a bug where when in "Beast form" (as they call it) your 1h weapon is still equipped, and he does a slashing animation with the weapon in his paw. Which looks ridiculous. Another thing that bugs me is that when you come out of Beast form, you're naked - which makes sense, but tis just annoying to have to re-equip all your amour and weapons. Especially if you're in the middle of a fight.
Pros are increased damage, and faster movement. But only as long as you kill and feed. So this could last a while, could last only a minute.
These aside, it's a nice idea though. I don't think I'll be looking for a cure any time soon, hopefully they'll fix the little bugs with it and I'll be using it more often.
EDIT: Although that being said about the Shifting animation. I'm wondering if you could use the shout to knock them back, and then switch over to the beast form power whilst they're stunned and knocked down...? Not sure if that would work, but they are two different abilities since one's a shout and one's a power. Can you use both in one day?