I can see why people are dubious about the benefits of these coilpacks on the 2.0 TFSI but on the 1.4 TSI they are a very important part of surpressing possible misfires and making higher power without the fear of misfires.
On the higher powered cars these should allow cutting back ignition without reducing power and should make sure the engine doesn't pull timing as much too.
I can see how people think of these as snake-oil, but in the right applications they aren't. For anyone at stage 2+ or above you should seriously think of these as not just a power mod, but a mod to preserve the condition of the engine and to be able to run a wider range of settings without inducing timing pull.