A review for Die cut stickers by Michael Matherne.
The quality is great, they're a good weight and the vinyl has a reassuringly long-life feel (to be determined by future sun and weather exposure). More than any of that is the fact that I submitted my art in a .SVG vector file format -- the format the original artwork was created in -- and StickerMule didn't even bat an eyelash. To date, >no< printer I use has taken that format (which is a very, VERY common and universal vector format), they all insist on at least a .PDF export (and some can't even get it right from that!). I really appreciated their flexibility.