Well, here are my impressions, categorized by road surface, hub position/t-case position: (this is a genI, 4d, front and rear lsd's, 33" muds with 2000kms on them)

-On icy roads in 2wd hubs/locked on the highway, it is downright dangerous, IMHO, and I will unlock the hubs next time I encounter said conditions. But on dry roads (AGAIN with hubs locked in 2wd) there is a little bit of feedback from the wheel, but no big change in handling.

-On icy roads in 2wd/hubs UNlocked there is ZERO handling effect.

-On snowy roads in 4WD/Hubs locked handling is predictable, and though slighly twitchy in turns, once you learn to modulate the throttle properly, it handles fine.

-OFFROAD... well, let's just say its a night and day difference. I've only tested it on snowy trails yet, but it was equal and sometimes better than a front locker for hill climbs. Turning radius is affected, but hey, that's why you have reverse... overall it made a huge difference to my truck's capability in the snow...

Having said all this, it appears I lucked out with a very tight unit, and I did not, nor do I intend to put friction modifier in the diff oil. If this was a daily driver I probably would, but for driving to the trail, its fine.

PHIL