All my expearence with lockers is with offroad rock crawiling apprications also (except for the limited slips for on-road). I & friends of mine have and have had D/L, Lock Rights, ARB's, Track locks, ETC. and you can ask any one of them which locker they would use and they would most likely say ARB. Cost usually makes most of us to use less expensive lockers. I think the ARB is one of the best Lockers made. It stronger than the rest and is very reliable. I NEVER had any problems with an ARB. The pumps that were problematic were the old design. Basically they would get to hot and have a melt down. That was because most people were filling there tire with air from the pump which would make the pump run continually. Normal operation for locker use only will not get the pump that hot anyway. You wont have a problem with the pressure lines if you install them correctly, taking time to cover them with vacume hose and zip tying them up. As for problems with the Locker itself, The older units had a problem with some screws coming loose. The lastest design does not. I am building another Landcruiser (frame up again) and will put ARB's in this one as well since the last ones performed flawlessly.
I would not waste my money on a Lock Right. I have had them break while driving down the road.
One avantage with a locker that u can turn off is that u have less tire wear and better handling on pavement. Just lock it in when needed.
well thats my 02 cents
good luck with you search for a locker.