The new Diabolus cranks are simply beautiful.
/* sigh */
I have RaceFace Turbines (taper... mated to RaceFace Ti BB) from 1999/2000 and they've performed flawlessly. I love their look too. I have been drooling over the Next cranks for almost four years now. The problem with RaceFace components is that they last so long, work so great, look so wonderful that it's hard to justify upgrading even within the same brand. I'd feel guilty about replacing my Turbines.
BTW, I do agree that RaceFace prices can be a little steep but given the choice between RaceFace and Shimano, I'll go with RaceFace every time.