I think this is the problem of the internet. A minority of people in a very large sample have an issue with a product, and very soon the whole world things it's a major issue. Pretty soon, you can't drive down to the corner store without thinking about "thingabob 1-1000" is about to fail and your Jeep is going to burst into flames and kill you and a bus full of kittens and nuns.
The majority of reports I read on the Rubicon locker is that it failed unlocked where there was a high differential of speed between tires. IE: in the snow or mud with the hammer down and one tires spinning fast and the other stopped.
I had a stock rubicon D44 (with 5.13 gears) that I ran for a year behind my V8 with stock shafts. It held up just fine, and I wasn't very nice to it. I did, however keep the locker engaged most of the time offroad.
If I were in your situation, I would put some good alloy stock spline shafts in it, throw some 35's in it, and see if you hate the gearing. If you do, put some 5.13's in it.
More than likely, you will never have an issue with the Rubicon locker and you can save $1200 on buying a ARB locker and compressor, and not have to deal with two separate air systems. I wouldn't even consider the OX locker.