definitely one of my favourites, both new series and classic. it's funny and exciting and very moving. i love how cute rose and mickey are with each other. and i love how clever it is -- the first time i watched it i liked it, but the emotions didn't quite get me. it all happened so fast. but then i realised it was a sort of metaphor for how all of the doctor's relationships with humans progress -- for them, he's a huge, life-altering presence throughout their life, for him, they come in and out of his life in the blink of an eye... but he still loves them. i think most viewers have at some point or another watched the show and been like, "omg, doctor, get over yourself and just enjoy what you have while you have it!" but this episode is a way for us to understand what it's like to be him. meeting someone, falling for them, sharing a few brief moments, losing them, all in the space of a day, over and over and over... yeah. it's pretty amazing.