I've made two large purchases from Deny Designs, and there were serious mistakes / quality control issues both times. While I agree that their Customer Support is fantasticprompt, streamlined, and immediately willing to replace the items at no additional costtheir quality control really sucks.
The first time I ordered from them, I purchased a duvet cover with two matching pillow shams, and an additional two pillow covers in a different design. I was very happy with the quality of most of my order, where the fabric felt silky and high quality and the printing looked good. However, one of the pillow shams arrived looking like it had gotten jammed in their printer and was mailed out anyway. The printing was crooked and overlapping in parts, and there were ink stains on the back. After I filed a ticket and sent in some photos, they were prompt in agreeing to replace that item. However, since all of their products are custom printed, it still took several weeks for me to receive the replacement.
I recently made the same exact order of two pillow cases, plus a duvet cover and pillow sham set. This order was an epic mess. (Incidentally, I'd found they had raised prices across the board including shipping in the 4 months between my orders) The designs on the pillow cases were printed SIDEWAYS (seriously, how does that happen?), and the pillow shams were printed on the wrong fabric. Basically, out of 5 items, only one of them didn't have issues. Again, I took photos and filed a ticket, and they were very quick to offer me a replacement. That's great customer service... however, they should work much harder at not shipping out so many mistakes in the first place.