The DMM V-Twin Belay Device lasts longer and stays cooler.
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Tough on the Carabiner
I paired this belay device with a BD Vapor Lock Biner. After about 3 months of weekend use, it had made indents on the biner that appeared to be more than cosmetic. I tried with another type locking biner but got same result. Functions as advertised but the stainless steel seems to damage aluminum carabiners.