This is one of my favorite films of the year. Messina and Fischer have a tangible chemistry, and while it's easy to look down your nose at the hipster vibe you might get from this movie, in a similar vein as Garden State or 500 Days of Summer, I feel like that's doing a disgrace to the script.
It's rewarding to watch Messina in this role, playing a guy who's easy to root for, especially if you're only familiar with his performance as Dr. Castellano on The Mindy Project. (He's great on that show -- it's just a rather different character.) He's got wonderful range, and I hope to see him pop up in more films.
Cinematographer Doug Emmett did an especially wonderful job here. Subtly keeping the palette in the range of cool blues and greys has great resonance with Tim's makeup, and really contributes to the film's atmosphere -- cold and biting, but a ray of sunshine here and there.
The plot itself isn't particularly novel -- although it is well written -- but what really keeps this engine running are the performances of the two leads.