I haven't heard of Radiance, but the silk rather scares me. When I want a silky feel to a quilt I use Northcott cotton which is the most amazing cotton out there. Well that is just my opinion, but when they say they make cotton that feels like silk they aren't kidding. I have some silk that I've had for over ten years. I keep thinking I will make a blouse out of it, but quilting has given me so much happiness that I don't make garments much anymore. Perhaps I could use it for something that wouldn't get a lot of wear, like a bed pillow set. Good luck on whatever you decide and thank you for letting us know about this new product.