Twilight was an episode I enjoyed on a lot of levels. Usually a time travel episode gets negative marks in my book, especially when the reset button is inevitably pushed, but at least they did it somewhat originally here.
The T'Pol/Archer fans use this episode as their holy grail. I always thought, as I mentioned earlier, T'Pol was behaving more maternally and out of obligation rather than attraction. It could've been her in this living hell after all.
But inevitably the reset button was pushed and we get a glimpse of how bad things could be and what the stakes are... even if we know it'll turn out all right by virtue of TOS having aired.