We did this on the Radiance in May and plan to do it again in Sept. We just put DH's suit in the dry cleaning bag and gave it to our cabin steward as soon as we boarded. It was returned the next day in time for Formal night. So much easier than worrying about packing it and wrinkling. It was only $7.50, less than at home with a coupon. Shirts cleaned and press were about $3.50. Anything just pressed was 50% less. We were very pleased.
Teresa and Larry
#36-Carnival Splendor 9/16/12
7 night Mexican Riviera
#37-Allure of the Seas 11/11/12
7 night Eastern Caribbean
Yep, I agree! They do an excellent job! If you look at their own clothes, you will see they aren't wrinkled, so they treat your clothes the same way.
We went a step further & gave them about 4 bags of laundry about 2 days before the end of the cruise since we didn't want to deal with dirty laundry on the way home. It was well worth it! All nice & folded & clean. Almost folder a very military style. It was nice. We were on Serenade of the Seas.