Quite amazing results - it can only be improved slightly.

They look amazing — the colour and text came through wonderfully. The customer service was exceptional during the revision process. We iterated five or six times to get to a satisfactory proof and each iteration only took about 10-20 minutes to process; Much faster than the 4 hour window they mention. The team and system behind the scenes is incredibly efficient. I would definitely recommend Sticker Mule. Feedback for future prints: There was a slight difference between the proof and the actual print. The images I chose became tiled / duplicated on the very edge. There is a chance that it would have been a better print with a "cover" rather than a tiled mode; At least for my design. That being said, they are 100% satisfactory enough to see the world.