My first set of good quality spotting scope and binoculars were a Optolyth TBG 30WAx 80 mm scope and a 10x50 Alpin (classic) binocular. Many of my friends at that time used them, various models and configurations. I was very saddened by their new generation NG series of porro binoculars. They are dimmer than the classic series and the samples that i tried had very stiff focusers.
As far as durability goes: Make sure that you get a waterproof model, if that is a requirement. Also, i've seen TBG scopes with holes in their bodies. Apparently, the synthetic material that they were made of cracked and was pierced when hit accidentally - though i don't know how hard they have to be hit for that to happen, no optical instrument is bulletproof.