I've got the WM Flash jacket, pants, vest and booties. I like the booties a lot. They don't have a stiff sole, so they're not the best for walking around a campsite, but they're great for sleeping in.

I've also tried Sierra Designs down booties and down mittens. The mittens work great (again mostly for sitting around camp), and the booties come with or without a closed cell foam sole (fairly stiff.) They also work well.