I have adopted the rear sprocket oiling now, with the viper dual injector.
This is because the front sprocket kept eating the drip tube
It works a treat on the rear, but the back wheel does get VERY dirty.
I'm still using the normal version, which, with a small bottle of oil as reserve to fill up if required, is good for a 3k mile touring trip. That is enough for me.
I'm not overly sold on the look of the touring kit, which by the way seem to have a habit of failing to work after a few years (I think the pipes swell, or go hard), if my riding palls experiences are anything to go by. Funnily enough, having to wind up the setting seems to be a common problem, especially if any of the pipes are pinched by tie wraps, or you take the feed pipe up above the height of the reservoir (almost impossible to avoid).
The new sausage reservoirs look like a smart idea though.
I know this doesn't help you now, but thought it might be worth mentioning for others contemplating changing.
Cheers,
John.
[Edited on 24-4-2006 by John W]