Not used on Rainier
Only issue with the saw itself is it's appetite for consuming the plastic inside the sheath. Otherwise I'm sure it's fine. Should be able to put it to use this winter when I take the JHMG Avi course level 1.
The bigger issue here is how the saw connects to the BD FlickLock poles. I can only connect it to the very bottom section of my BD Expedition poles (22" long). Since one of the uses for the saw is for cornice cutting, I know I'd certainly like to use the entire pole for this. 22" doesn't give you much unless you're on a mini mountain with mini cornices!