I use CafePress, both as a customer and as a seller. For sellers, it is a great way to make some extra cash selling your designs and concepts, and it is fun to share our creativity with the world! As a buyer, there are so many unique items and designs available, on so many products! There are occasional quality issues, but their customer service has always been great, and whenever there has been an issue with an item, they are quick to send out a replacement at their expense. I highly recommend!
Thanks for the feedback, Stephen!