Gidday - unless they are absolutely top quality, I think you will be very disappointed - 12x generally have a small field of view, will be difficult to hold steady and will need to be physically large to give the light gathering ability that is so important to locating game in mountain country (even during the day you need to be able to see into the shady gullies etc)
I hunted for years with good quality 7x and spotted as much game (mainly Tahr) as anybody. When I had the opportunity to go "top shelf" I looked through a lot of pairs of bino's, and for my eye, 8x was best, the 10's tended to restrict my ability to "scan". Everyone's eyes have different scan habits and its critical that your bino's suit you habit . . . .
Cheers
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