In reply to drsdave:
I have a Suunto Core that gets used in the Alps, but unless you put some effort into how to get the best out of one, it won't be much use. For example I calibrated mind at the Col de Balme the other day, and watched with amusement as my altitude rose several hundred metres before I went anywhere, and by the time I'd finished the descent was still reading higher than when I set off.
They have a use, but I wouldn't put serious faith in altimetry for navigation in changing or inclement weather, which is probably the most useful time to be able to do so to be honest. If you can see the huge granite spire and the winding glacier, navigation generally isn't a huge problem...