So I have a the 2011-2012 pair of sl's... They feel good all around. The only problem,"which is a big one", is every time I land with any kind of real pressure, the back foot ankle strap slips to a point of dangerous towards injury. I thought the teeth might have been worn down, but looked fine visually. I replaced them anyway to no avail. So I let the strap out a little in case it wasn't set long enough for my foot. No help... They just slip out all the time. Actually, I can't even tighten them down enough from the start. Which is a disappointing way to start each run. Seems like they could make a more solid ratcheting system for the price... Besides that, they seem like they would be perfect. Hope somebody from Union reads this.i gave it 2 stars to bring the overall rating down on the overview page.