Bought it as an alternative for the Matthews Matthellini Clamp, and it works fine. I use it to hold something that weighs about 4 kilos, and every once in a while for a short amount of time has to withstand an additional 15 or so kilos, and it works. So i am satisfied with it. Quality looks good.
If your choice is between this product, and the one I have mentioned above, then the Matthews would win in my eyes for sturdiness and general trust in the ability of it to hold the weight you put on it. However, it is a good and still reliable alternative for it, for less money.