I made a pair of them as well and like you said they weigh around a gram and probably rate at 500lbs or so (taking into account strength degradation from using a knot) . The only trade off to using them is convenience. You cant use them one handed and if your suspension system is under any load they are a pain in the butt to take off. That being said they are still in my kit, but I wanted to give another option a try.
Edit: changed oz to g