I've never had any issues with PED use on CO mainline, but on XJT (Continental Express) the FA's are very zealous about PED's - recently I was told I could not use a handheld Garmin GPS (fine, I put it away) but the FA went on to lecture me "You cannot use a GPS on ANY AIRLINE" which is pure b.s., United for one allows them. And I don't know if CO mainline allows them, but I've never been challenged for using it on a mainline flight including EWR-HKG.