I always used 1 point Shiver for my sorcs, it is just a handy 1 pointer that does alot. May latest sorc Freball/Met I only invested in Freezing Armor and had this wand on switch wiht +3 shiver. Well, I hit like 75ish and did some gear changeing and realized I still had no points in shiver so I just used Freezing. She is doing great with that so I never got Shiver.
IIRC Shiver freezes, frozen chills.....distinct difference and advantage, but either as a 1 point wonder are good.