I bought this because my current setup (5D MKIII and Glidecam HD4000) was HEAVY! I bought this shackle thinking I could hold my mount and shoot longer based on the reviews I read here on Amazon and other online sellers. Personally, this mount didn't work for me. I think it works if you have weak UNDERARMS, but after trying this stretch I've found that my biceps tire just as quickly as my forearms. My recording time with a planer camera was similar. Again, I will say that this relieves the forearm, but you also need bicep strength. In the end I sent it back.
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