Thanks for your feedback guys. You know, I thought it was always proper to trim the clear edges, but after seeing it on two separate aftermarket decal sheets, I started to wonder.
Chris - You're right about misleading info from manufacturing. Maybe this suggestion is put there for the less experienced, or less careful modelers to try to ensure that they end up with a presentable model (without cut-up edges). I know what you mean about a slip of the knife. Amazing the depth of color in human blood, eh?
rjk - I thought about the thickness problem, too, but the quality of decals these days gives us good images that are so very thin that usually my final flat coat hides it all.
Thanks again to all who answered and a very Merry Christmas to all.
Stinger