To be honest, at first I was not a fan of the 247 case, (mostly because of the bru-ha-ha on here about it). But after taking it offroad quite a few times, it has more than proven itself to be capable. The spin-up time of the front wheels is almost negligible, when you need the traction, its there. If I ever have any doubts as to it being able to engage in time, I can just always put it in 4Lo.
I agree that it is fantastic in the snow, especially if anyone else is driving your WJ, such as girlfriend/wife/kids/etc. You don't have to worry about them knowing how to engage 4WD properly, knowing which gear in the TC to use and worry about them getting stuck. My WJ is basically point and shoot when it comes to snow.
99' WJ, 2.5" Rusty's, Bilstein 5100's, JKS TrackBar, Moog SuperTrailBoss
"With enough fabbing, time & $, it's certainly possible.
That being said, it's like boinkin' your sister...just because you can, doesn't mean you should." - Double E