I have tried many of the competitors versions and have come to 2xu. In particular I tried this product because while I love the core compression pairs, I wanted something for my runs.
The first time I wore these for my runs, I was able to extend my length of run by an extra 2 miles and my 5k time dropped by 4 minutes. I’m not a fast runner and I don’t bye the “they are more aerodynamic making you faster”. I’m my case they made my legs less tired and let me go faster longer.
As to fit I love the compression they provide. I fall between L and XL and chose L for the extra compression and glad I did. They fit nice on my calves and thighs and really just stay out of the way.