Just tried out my replacement Tim Holtz WORDPLAY Die, as you can see on the left. From one pass through my Cuttlebug (with 2 long "B" plates) and super smooth card it had trouble with "X" "Y" and "Z" at one end and "N" "P" "Q" and "&" at the other. And I don't just mean little nicks which didn't cut properly, I mean whole sides/sections.
I then had a go with these letters individually passing them through a number of times and that only left "N" and "Z" needing a tear out of the card!! Hope to try the die in a friend's Bigshot too but I suppose it is liveable with this time.
The photo on the right shows the problems I had with the original die. At least straight edges are easier to cut out of the card.