My brother in law has a piece of this kit, and is pleased with it. I use Windstopper stuff from Frank Thomas which does the same job, and is bloody fantastic. Any clothing with a windstopping membrane is well worth the money, in my 'umble opinion and experience.
The Cold Killer gear works well, just a pain putting it all on, but I'd rather be warm
Got a pair of under gloves for sale, cheap, bought wrong size for SWMBO.