I bought Jason's decals too and they now sit on my sandman with pride. The colours are crisp and clean.
I did however when Jason had to have a bit of a break buy some of the Tassie stripes just in case. The colours were simular, but not quite as vivid and crisp on the Tassie ones and even though kept in a dark room flat I noticed some browning on the edges of the stickers. Not to say that this would show up when they were put on, I just felt more confident with Jason's ones when you put the two side by side. The other ones will be kept and will either go onto a mock up (when ever I get time/permission). or they will become a feature in the one day bar!!