Hmm... from the pictures on Zecho's homenode, it looks like the printing is in metallic ink. I personally wouldn't buy one if that's the only option.

The metallization sometimes comes off in the dishwasher

The metallization often does not get along with the microwave

Please consider a white mug with Plain Ol' Black ink or make sure that the metallization is indeed microwave safe! Look here more info on fun with microwaves ;-)