I switched my pair of Cirque pros for boulder x's and used them on a trip to canyon lands. I blew through the boulder x's in less than two weeks using them in slot canyons every day. The sticky rubber was great but way too soft to last very long. Also the leather splits along the top of the toe rand. I would go with something other than the boulder x.
Gerber recommends that you take the saw out of the handle while you use the axe, that makes sure it doesn't fly out on accident and if the handle fails in any way the saw isn't in there to make the matter worse.
Here is me in my Boulder X's at the top of Mount Gilarte in Puerto Rico.
The Boulder X is exactly what i was looking for when I ordered my cirque pros back in 07. The Vibram sole is the #1 best upgrade to the shoes. The styling is much better and the inside is so much more cushy. They still have the nice solid feel of the cirque pros. The improvements to the shoes I couldn't have done better my self. It is like as if La Sportiva read my mind while I was going through my pair of cirque pros. I got these things right before I made a trip to Puerto Rico and these things worked great. They hooked up great on every thing from guano covered cave floors to the slippery slimy wet rocks in El Yunque rain forest. The sole on the old cirque pro I wouldn't have trusted in so much mud, but the new Vibram sole hooks up just as good on the mud as it does on rock slabs. Very impressed with this awesome shoe.
These things are sick. I bought mine back in 2006 and they are still rockin. They get even more comfortable after you wear them for so long, they look even cooler when they start to wear. The only thing I regret about buying sanuks is that I want so many pairs of them that I can't afford them all.