Wolford IS so worth it! You're right gracelikerain - those Polar tights are AWESOME. So warm, so cozy...
I also have a pair of the opaque tights in black. The first day I wore them it was rainy and I had to wear my rainboots on my walk to work. The boots rubbed against my calves and pilled up the tights, so now I can only wear the tights with boots. They look great with boots (and not just rainboots, of course), luckily.
Silly me...