I love, love, love my Oberon cover. I am currently on my second cover. The first was for my K2 which I was able to sell. The second one is now keeping my K3 warm and cozy. The quality of the workmanship is excellent and I the cover only enhances the beauty of the Kindle.
I don't consider the cover to be heavy and as chas0039 said, Oberon is a family owned and run company and they are truly about "customer service". I debated back and forth on whether I would get one for my Kindle 3 because they are expensive, but once you have one, there is no doubt that it is $$ well spent.
I hope your wife loves her Oberon (no doubt she will) and kudos to you for being a terrific hubby!