I don't know if this qualifies as "customer service," but about 4-5 years ago, I sent an email to corporate about some odd grammar in a few hard-to-read passages on their website. I am an attorney, and I write for a living, so I offered some suggestions on how to clean up the language. Not only did they use my corrections verbatim, but also they gave me a one-time 25% discount on any in-stock product. That was really cool! I can't recall what I bought, but I ordered something right away. That was very nice of them.