I spilled a full glass of iced tea over our Dragon issue with the Taimat cover. I don't know what the material is you folks are using, but the cover was water resistant enough that I was able to grab a towel and wipe it off before there was any damage to the cover or interior pages (except a little along the top). You won't hear me complaining about production costs!
After you posted this I wanted to test it but can't bear to ruin one in the process. The same day I spilled ketchup on my brand new shirt, only to have a glob of it roll down and off without a trace. Needless to say, I really love the stain-resisant material I expect is in both.