I've had these tights in "large" since the beginning of this year. I am a runner and have trained and raced in them a fair bit (they are great for hard interval sessions and hill work). I'm a size 12 woman and they fit pretty well - the only down side is that there is no drawstring at the waist so they do tend to slide down when you first run out in them, so make sure you pull them up properly in the leg. They are fabulous value for money and really have helped support me training and for recovery (I keep them on for a couple of hours after racing and have slept in them once!)
They are still going strong and as we move into Spring I'll swap to compression shorts, so will have these tights ready for Autumn/Winter 2012/13.