woah, that looks impressive
The clumsy Casio GPS watch was very basic but actually worked and could be quite useful for basic GPS-ing.
The Suunto x9 at least looks much better
But mostly main problem is batteries. I wonder how long they last as normal GPS's quit within one day and you do not want your altitude record being erased because of the GPS I think.
But it could work, as most mountain areas do not have detailed maps of them a huge GPS with maps database etc is not useful anyway. The x9 could help in retrieving your camp/cache etc. Would have saved some lives in 1996 on everest I presume...