I have a Kindle and a Kobo. I do prefer the Kindle but I like the Kobo well enough.
They haven't made the H2O for a while so my guess is that the reason Kobo won't honor the warranty is that they don't consider it new. Fortunately Amazon has a 30 day return policy and you can get a Square Trade warranty if you feel the need. They're very reliable.
I'm pretty sure the Oasis does have something comparable to the comfort light but with a different name. I've never actually used an Oasis so I can't be sure. I have a Paperwhite which has mostly the same interface as the Oasis but a 6" screen. It doesn't have the adjustable color in the light, just adjustable brightness.
I do have a Nook with adjustable color and when I got it I added just a tiny bit of orange since that was easy to do. I've never changed that. I personally don't see any need for that feature. I read before going to sleep all the time and I sleep very well.
I have helped a friend set up his H2O and I read a bit with it while I was checking it out. It's a nice device.
Barry
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