I don't want to bash a particular vendor, but a local friend found out not all diff bushing upgrades were created equal. Even if they are from a well known vendor, who did make things right with a replacement set. Claiming he got a lemon, and that they've had drifters not have the same damage.

I'd stick with energy suspension, simply because they give you a metal sleeve to go in the center of the diff bushing. Without it, you'll end up like my friend, wondering why he has a strange clunk, removing diff bushing to investigate and finding out they've been goatse'd.