So far I've only purchased the Amazon cover. I'm very pleased with the cover - it protects the K2 but doesn't add much weight or bulk. Since my
K2's got a rather wild skin, I like the look of the plain black cover.
I did buy a Kwik Tek Dry case to protect the K2 at the beach. If someone came out with a cover for the K2 that offered waterproof protection, I'd buy it.