The Cover Project

I was wondering if any of you used The Cover Project's website to print out high-quality case artwork for your games, specifically your cart-based games? I'd heard about this site a while back, but never gave it a second thought until last night when I saw a youtuber's collection video where he used universal game cases to house in loose carts, and used the scans from the cover project to place in the display insert on the cases. They looked really, really good surprisingly. It got me really wanting to possibly start using this website to print case artwork for many of my loose N64, Genesis, SNES, and NES carts (I have very few boxed games). I just wanted to know if you guys have ever used this website for your game case artwork, and if so, what has been your experience with the quality of printing the scans out and all that jazz. The link to the youtube video I was watching is below if you're curious how the cases look.

http://www.youtube.com/watch?v=q3NXwoq27to

I have never used it but know some one that has, and the quality of the prints depends really on how good your printer is he used regular A4 paper to print it on and behind the plasic cover of the cases it looks pretty good, and as good as you will get unless you use glossy paper.