I use a Tri-Tech Tactical, a Stack Delta II. My whole squad has them, and they've held up through six months in Iraq with zero failures or fraying.
I could be biased, as I know the owner, and he kicked down slings and pistol leashes for the whole squad, and the bill said simply "Thanks for your service, come home safe". Over a grand out of his own pocket, and all he asked was that we have a beer with him when we get back.
Good gear, and good people.