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I just got my first Shun, and I am impressed with it. I don't know about durability yet as I've only had it a few weeks. Don't pay full price for one though. You can usually find them on sale, sometimes as much as 50% off if you are patient.
My only other experience with knives is Henckels.
I had a couple of friends who bought rings from there and they all came in as expected, so I bought mine there as well. Each diamond on the site usually has the GIA certification sheet scanned where it shows the imperfections. You might be able to find a discount code online for the band and pay by bank wire because you'll get a discount there too.