They should work, but don't bother, get some Gore Ride-ons. I've used Flakjackets, they are not fully waterproof, water can get in at the junction of the ferrule and the liner, once it's in it wont dry out, and tou can't pull the things apart to oil them, which would defeat the object anyway!

Just to throw another option in the mix, how about XTR SP41 outers and inners? Never had a problem with them and virtually maintenance free if used in conjunction with middleburn cable oilers. (Either full outers or split)

not really they don't work. The outer is slightly too big to go into the mech and the shifter. I had to bodge mine up with a knife