Re: Lock Rite
They are the least rugged of the lockers, but lots of people use them with good results, and if they break they are easy to fix, usually. If you don't get crazy with them they should be fine. They take a little getting used to on the street.
Are they worth it? I think so. Easy to install, good results on the trail. They are going to add stress to other components in your axles, and neither of the axles you mention are considered very strong.
Like I say, if you drive it sensibly you should be fine.