I love Frogskins. Great fit, lightweight, super durable and fantastic optical quality. They are great for any activity, but I particularly love them for snowboarding since they reduce glare without blocking out too much light. Perfect for tree runs on a sunny day or any situation where you are transitioning rapidly between bright sun and shade.
If you are looking for a high mirror finish go with the irradium lenses, the standard gray polarized lenses ar not as mirrored and seem to be a bit more translucent.