It's been quite some time since I last bought a pair of Levi 501s (although I do still own a pair from around 2000) so I'm perhaps looking at these through more critical eyes. Compared to my older pair, these are definitely thinner and not quite as well finished in some areas. Quality aside, they do look good, though, especially in this sub-darko colour scheme, which is a nice alternative to the lighter shades. They're also quite comfortable, and both the length and waist sizes - mine are 32 / 32 - were spot on.
But having said that, these jeans are quite a bit tighter around the thighs than my old pair - not quite to the point of discomfort, but not far off. I'm fairly slim so it's not just me getting portly in my old age, and there's no way I'd wear these all day if comfort was an absolute necessity. I ordered a pair of 501s in another colour at the same time as these and the other pair was far too tight to wear and had to be returned. This difference in sizing (perhaps down to quality control issues) makes it difficult to decide which size to buy as you just don't know if the ones you order will fit correctly or not.