I just bought these and I've only worn them once...and now I'm returning them.  They're really cute, but the ties constantly slide down so you're constantly having to stop to re-tie them.  I tried tying them in a double knot and that didn't help at all.  I have kids and I can't be stopping every 2 minutes to redo the ties on my boots while we're running around - whether at home or out running errands.  Too cumbersome.  And yes, as others have said, they are also very slippery.  I gave them 2 stars only because they are cute, and they were comfy but they just require too much attention.