Finally...my hands are WARM!
I also suffer from Raynauds, and finding protection for my hands has been no easy task. I was very pleased when I got these outside in 20* weather with sustained winds. Fingers stayed very warm, while my thumbs were a little cold, but completely tolerable.
As expected with a mitten, you have limited function. I hope it gets a little easier as they start to break in. My only complaint is that I wish the cuff was a little wider...its a little narrow to fit over heavier jackets.