In reply to neuromancer:
If anyone was still interested. I tried a few (Rab as an example) and they were pretty bad.
Ordered a pair of Alpkit Kantju's and they're great. Impossibly light and you barely notice them on.
I have size 9.5 shoes which technically puts me in the M/L bracket, but I ended up after trying on with S/M. For boots the ML makes sense, but for running shoes it's too loose at the top (and I have big calves) and at the bottom. The S/M are much more snug and just cover the top of the shoe, which is all you need really.
Also, they've updated the underfoot retainer since the photos on the website and all of the reviews. It's now an amsteel-like thin dyneema cord. Looks bomb proof.