Hi there 
I used minted for our save the dates- and they were GREAT! I decided to go with them for our invitation suites as well and am now in a bit of a mess with them..
Our invites were printed in an incorrect color (Ivory when I ordered blush ) and the RSVP's were printed in blush...but not the same blush as the sample I received or the matching envelope liners and stamps I purchased to match the suite. Minted agreed to reprint and expedite shipping as well as give a small a small % off the cost. They arrived again and are still not quite right... they are both blush now- but still not the same blush as the other suite components.
Do I ask to have them redone yet a third time or just suck it up and use them?
I guess I wouldn't be as frustrated if I hadn't sunk the amount of $ I did into paper products...but I wanted them to be pretty.