Hi pooh lovers mom,
We used the FITS pass, purchased through Paramount, in Dec. We also had the vouchers and went to the Guest Relations desk outside of Epcot to exchange them for regular sturdy paper-type passes. FYI, adults and older children (10 yrs+) must do the biometric finger scan at the gates also, when using these passes.
Many on the DIS have used the FITS passes with much success, and no trouble whatsoever redeeming the vouchers. We ran into a bit of trouble with a CM who was reluctant to issue the passes to us since we are from the U.S. and these passes are marketed overseas. She contacted a supervisor of some sort who talked her through the process and we eventually got our passes, but it took us 30-45 minutes at the window. Still, we would buy these passes again because they are such a great deal...and hopefully have a better experience at Guest Relations! Good Luck!