Fit: The waist is pretty big and stretches a lot, which is kind of annoying for me because I have a bit of a booty, but since I got a skinny pair, the pants stay up since it's snug everywhere else (butt, leg, thighs).
And as I mentioned, I have more butt than the average girl, but these jeans actually flatten my butt, which could be good or bad. Good because I don't look big. Bad because I look like a boy.
The length of Uniqlo jeans is perfect because they offer free alterations! Note, mine shrank a bit in the wash even with air drying, so when getting them pinned I would give yourself a little extra length to accommodate for shrinkage.
Material: They're thicker than some of the designer denim I own like James or Rich & Skinny, which makes them slightly less comfortable, but they've held their shape pretty well between washes.
Fly: The zipper is smooth, but I sometimes wish the fly was a little softer so it wouldn't look so flat and stiff.
Color/Wash: I'm not a fan of their lighter or whisker-washed jeans, but their solid dark denim is nice. Side note, I love their colored jeans, but the material and fit of those are different from their denim!
Sizing: True to size (size 4 = approx 26" waist), but if you get the colored jeans, you might have the size down because those stretch a lot and you're not alone if you fine their colored jeans to be less flattering.
Price: Retaling at $49.90 and occasionally going on sale for $30-$40, they can be a good deal if they fit you right.
Overall, they're not for everyone, but if you have the opportunity to stop in Uniqlo, I would recommend their jeans if you're looking for a basic, affordable pair of denim.
An old Uniqlo denim commercial from 2007.