I typically don't wear shorts unless at the gym or doing something outdoors, but bicycle commuting to work in Atlanta summers has forced my hand. I looked all over for some slim-fitting shorts, and finally decided to give these a go. I bought a pair in each color.
First, as others have stated, they do fit skinny, both in the waist and leg. I have chicken legs and typically wear 510's, and these fit about like those, but they stretch A LOT. They're kind of a thinner cotton chino material with a lot of stretch, not really denim at all. I like them, and the light weight is nice for the heat.
Sizing...As others have stated, I would size up an inch. I wear a 32 in Levi's usually, sometimes a 33 (which gives me a lot of room), and a 33 in these fits me like a 32 in regular jeans. I've worn 511 shorts before, and these are consistent with 511 shorts--skinny and a little smaller at the waist.
I've never really been super interested in the commuter series, even though I do commute, until recently I got tired of the crotch of all my pants getting shredded. There is a definite difference in quality between normal Levi's and the commuter series. There are more details, better durability, and the fit is better (higher waist in the back is nice not only for commuting, just for covering your crack).
Overall, really nice shorts, and the fit on my skinny legs isn't too tight, but slim enough. I didn't like the look of the reflective tape on the sides, so I just took an Xacto knife and removed the stitching and took it out. It took about 10 mins. The green shorts look almost the exact same color as the picture. Maybe a touch lighter, but really close. I was hoping they'd be a bit lighter, but I guess they'll fade with time.