denhol i have listed it in the equipment priorities section, but ultimately i didn't feel the need to include it as it's a relatively small boost once you consider the poison penetration from aspect of the viper and the inherent res shred from poison itself.
even vs bosses it's only 4.5 to 8.5% more damage at late game.
i guess it's good to take early on when you haven't got as much aspect of the viper effect but it's never that substantial of an increase