I had a chance to use the x-monsters (and the Nomics) at the Ouray Ice Fest a couple weeks ago. I wasn't too impressed with the Grivel (except that it is nearly 1/4 the price of a pair of Nomics). The tools pumped me out pretty quickly, and I didn't like the balance too much. The Nomics, on the other hand, were incredible. Great swing weight, solid, easy to match, and the pinky rest thing is adjustable. Now if only I had $550 to spend on a new set of tools...