I've used the Shadowscapes deck heavily over the past year, and by 'heavily,' I mean frequently... My deck (which I bought new, from Amazon) came to me a bit warped; a slight curve rather than lying flat. I recently purchased the Tarot of the Hidden Realm (also new, same publisher) and it's also slightly curved in the same way.
Over time, my Shadowscapes deck has warped diagonally. It may have gotten that way from testing out the riffle-shuffle method, but I had to have done that shuffling style no more than five times, yet it was perhaps enough to get it all bendy that way and it won't go back to normal. Every few months I put it under some heavy books to help flatten it out, and it helps for a while, but it eventually reverts back to the same diagonal warp. I have quite a few decks and it's the only one I've had this problem with (but I've never done any riffle shuffling on the others, and never will ever again on any deck)... So my point is that if you shuffle carefully, I think it should be fine.
Other than that, it's just regular wear in that the edges begin to look a bit more tattered. Nothing along the lines of having to glue anything down... such as tearing!? Yikes, no way! I think you'd have to purposefully mangle the deck to get these cards to tear. Mine don't even have a single crease.
