I've only used an ATC for the longest time to belay and ended up tweaking my right shoulder because I held it down so hard to break especially belaying larger guys. After going on a trip with a bunch of ladies my size, they all had grigri's and said that I NEEDED to get one. After belaying my boyfriend who is twice the size of me on a grigri, I probably won't use an ATC again to belay him. It makes a huge difference on me now when I belay him while he takes or falls, not having to use as much force to keep my break hand down compared with an ATC.
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