I like most everything about these cards, but it's not going to sound like that after you read the next few lines, so, I apologize in advance. I've played, and dealt, with these almost exclusively over the last few weeks and I have one main complaint... the corners are rough and sharp. Can become slightly painful at worst, annoying mostly. The corner kind of digs into the thumb/palm area, and sometimes can be painful. I've used 2000 grit sandpaper to try and ease the edges.
I've alternated mostly with Modiano Platinum and Belgium Cartimundi in comparison and neither of those give the same issue. Their corners seem more radius. That's the bad part.
The good part is they shuffle and pitch as good, or better, than any card I have. They have a nice feel, are more flexible than the previous generation. I would prefer just a slightly more flexible card, but, that's just a personal preference.
Too early to tell about durability and colorfast quality, but, so far I've seen no quality issues. Fonts are great. I love the back art. I believe Justin is really onto something with this series. At the price point I think you can beat them. With minor tweaks I believe it could be a world class card that rivals the best of the best.