we used them for our first cruise, and they really do work well. I have to say, we didn't have any noticable wrinkles (but I also took them out immediately and hung them up. We also brought along Downey Wrinkle release and I gave them a spray once they were hung.
A tip someone told me and I want to share.........if you're flying to your destination, just be careful about weight. When you use these bags, you can pack a LOT more! (trust me on the weight part lol)