I can't add anything, I'm afraid, as the nearest I get to rubber boots is a pair of short wellies I bought for avoiding the mud at a festival... Weirdly, however, I had a conversation about rubber boots over the weekend. Friends recommended Viking boots from Norway, due largely to the excellent neoprene lining and rugged sole. They seemed to be very cold weather boots tho - they'd been lent them on a trip to Antarctica and had been so impressed that they sought out a couple of pairs.