It depends on where you live I think: New Zeland inhabitants will get it rough. I'd prefer 500 days of spring though, because summer gets too dam* hot here.
Personally, I really enjoyed the movie. I was skeptical at first, because it looked like too much of a chick flick to me so I was reluctant when my girlfriend said she wanted to go see it. Surprisingly enough, it turned out to be a really artistic and well-done movie.