I live in grande prairie alberta, we get quite a bit of snow here, and its in the winter time i find the biggest difference... i was disapointed right away the first time i drove in the winter with my new truck, as my old one was anti-spin. I have to drive my truck in 4x4 alot more often than i should. also i don't like the way an open diff handles should you break loose spinning, its not as predictable for regaining control as a unit with lsd because the wheels can switch up.
as of yet i haven't looked at the aftermarket, just as funds won't allow right now, but i'm definately interested in doing that next spring