I've worn these for a few runs with temps in the low 40's, where it's a little too warm for full-length tights, and a little too cold for shorts, and they do an INCREDIBLE job keeping the leg muscles warm and active. Furthermore, I have a pair of Virus full-length tights that I wear for cold weather, and get a little shy wearing them, but these 3/4 are cut differently and patterned differently. I threw shorts over them on one trip to the gym the other week, but I'm quite comfortable wearing them alone for outdoor runs.
If I could give half-stars, I guess I'd go with 4.5 overall because there are no pockets for keys. But that's the only negative I've found so far. Great investment!