its a shame there's no alternative to the Derailleur system, even with my xtr set up i still find i need to tweek the gears on nearly every ride or change up 2 and drop 1 just to get them on the right gear!! this rohlof system looks interesting, they clame it weighs no more than a derailleur system and it has the same amount of gear ratios as a 3X9 Derailleur system, plus it only needs an oil change once a year. the only downside i can see is that it uses crappy grip shifters!! oh, and the price is a bit of a put off as well!!