I have had Gen-Mar's on a couple of CBR1100XXs and both my ZX14s, and they work great, easy install, and no need to change cables. Not a huge difference, and there are plenty of other options/brands that can raise the bars even more if you like. I think some guys have even run (for instance) BOTH Gen-Mar and Heli-Bar risers concurrently. I also added the lowered (Buell) pegs, a Corbin seat, and a ThrottleMeister, and I love the combination of comfort for the slab while still being able to "get down" for the twisty bits. Definitely NOT ready for the C14 yet! :-)
2013 ZX14R ABS, Red, Scorpion Serket Carbon slip ons, centerstand, Rizoma Mirrors, MRA DoubleBubble, Gen-Mar risers, Buell pegs, ThrottleMeister, GIVI V35, Corbin saddle, backrest and glovebox, Power Bronze Hugger, Radiator Guard...so far...