My experience: I have a whore of a Lock Right in my Dana 30 that has been in about 5 Jeeps including the one I got now. Only thing I have done is replaced the springs and pins. It locks 99% of the time. That 1% it doesn't lock is at the steering stops, which is a good thing. As for the rear, it will have a Lincoln locker very soon
I have a Yukon grizzly locker in my D44 and I love it. It's really no different than a Detroit locker except it's cheaper and I have a lifetime warranty with a one year collateral damage coverage as well if the locker breaks. My jeep is my DD and the locker is very well mannered on the street. I know it's there but it's very quiet and predictable. It rarely scrubs the tires. I didn't even want to mess with a lunchbox locker since I've read that they can be noisy and sometimes harsh on the streets. Plus the grizzly replaces the carrier so it strengthens the rear end as well. I recommend it
Completely stock, and keeping it that way...
Richmond Powertrax in a 29sp 8.25. Its a little noisey but is fairly predictable for what it is. I run a 30sp ARB in front also. So far this Richmond has taken a beating. I bought it second hand and its held up well.
I have a spartan in the rear of my XJ, It's my wifes DD an it gets wheeled hard. It is invisible for the most part but you do hear it ratcheting some times when going around corners. I am a firm believer that the only locker that should go in the front diff has to be select-able.
I've got an Aussie in my 8.25 rear. I love it. On the trails, it lets me and my near-stock XJ with street tires hang with the JKs on 35s no problem. If you have money to burn, get a selectable locker. Me? I'm a cheapskate that drives like an old man most of the time, so the auto locker works fine for me. The only time I ever notice it is giving it too much gas during a turn, which chirps the tires, or letting off the gas completely while on the highway. Releasing the torque load on the driveline initiates some slight body roll but when you know it's going to happen, it's not unnerving in the least.
My build thread has pics again. http://www.jeepforum.com/forum/f177/kevin108s-2000-xj-build-867428/
I have a Spartan in my 8.25, and an Aussie in the front that I just broke along with everything else in the front diff. Bad pinion bearing + rocks = destruction on the trail. I have the front fixed, but didnt realize the Aussie got chewed up as well, so I just ordered a Spartan for my D30 off Ebay yesterday for $270 and free shipping!! Im on a super tight budget to so I can only do so much.
03 Rubi - Jeep in progress
Just a poor married guy with two expensive hobbies.