I know people who have been running lockright for years upon years and had no problems with them.
You DO NOT have to mess with the gears to install one. All you have to do is pull out the carrier, remove the spider gears, install the locker, and put the carrier back in.
I am willing to say that you will never have to rebuild a lockright. I would also go as far to say that you could have one installed in less than 2 hours if you are good at pulling your rear end apart.
And for limited slips, they are only good if you plan on staying on the road. If you wheel your truck, don't waste the money on a limited slip, buy a locker.