Me 3You will love it. I have a Lock Rite in the rear(8.8) and an Aussie in the D30. Love it! It is harder on joints but its worth it IMO.
Snow and ice is different but not bad. We finally got a winter after having the locker for almost 2 years and I like it. I drove through the nieghborhood to get a feel for it and it was no problem. Even on straight Ice it wasn't a problem. It also made for more controlable power slides.
OK...few points need to be made. Aussie for front is OK with some sort of front disco. Otherwise, it will cause steering issues, especially in snow/ice. If you want to run 4-wheel drive for snow/ice highway driving, you don't want an automatic locker...why I went with an E-Locker up front for my XJ with the NP242 (full time 4x4 option). Steering without wheel spin/skid is essential!
That being said...just be careful...get to know the limitations...
I love having selectable lockers front and rear...to handle any situation, be it highway or slow off-road rock crawling. Personal opinion..I know.