Along with Before Sunrise, (actually, I got the two confused - similar titles, but they're two parts of one story, and Sunrise comes first) it is the cinematic equivalent of Romeo And Juliet. They are in every aspect perfection, and showcase some of the best work from their two leads, including the inspiringly talented Julie Delpy, and they make me cry every time I see them. Only films like The Dhop Around The Corner, Sleepless In Seattle and An Affair To Remember can compare in terms of sheer quality.
Buy them, watch them recommend them. They deserve it.