My review: Slightly (expectedly) predictable, and in that regard slightly underwhelming, but quite a few funny moments and interesting tidbits, which more than makes up for it. As a whole, something was missing, but the separate details where good.
I think what was missing was a different ending to tie it up better. One would think that Twi being smart as she is, would have figured out at the end that her going back in time to warn her not to freak out would cause her to freak out in the first place (not to mention she could have seen it coming long ago, but then again, then there wouldn't be any episode).
I would have ended it, in her realizing at the end that she causes herself to freak out by going back, but then she does a small lecture to herself about the predestination paradoxes, and figures out she doesn't wanna bother with the "the mind is boggled" stuff and the danger that the universe might implode, and she concludes it's best for her just to go back in time anyway (this way a sentient choice of her doing or not doing it is added to the philosophical mix of the day, and makes the viewers even more baffled with time travel and makes for a better ending, because she made a conscious choice of making the time loop stable, and then we wonder that because of the fact the time loop obviously exists, whether she really even had a conscious choice or whether it was predestined for her to make that choice.
Of course, the moral stays, not to freak out about things that are out of your control, and that sometimes being too worried about stuff and over-thinking things, sometimes cause things to go wrong in the first place (been there, done that).
Something between a A- and a B+
This review was brought to you by Pony Cola.