I've now ordered die-cut stickers from several different vendors. The Sticker Mule stickers are by far the best in printing quality, cut quality, ordering process, fulfillment time, and - most of all - sticker material quality. People comment all the time about how these stickers are so much better quality than others. I don't know the technical differences, but the material is thicker and has a nice semi-gloss/matte coating. Very nice. We work hard to elevate our brand and provide a premium product and premium service... These stickers embody that goal. 

Best Stickers I have found!