Those look a lot like the Warn ones I have on but without the skin. I put them on after bashing in the rail just under the passenger door (which was off, fortunatly) on the Big Sluice on the Rubicon. I had the factory sliders on but they didn't come up quite high enough. I did hear from one other Unlimited owner who did the same thing at the same place and, like me, the only body damage afer several runs through there and other wheeling.
The Warn's, and I am sure others, have that higher bar on there for a purpose. I would have welded a similar bar to the stock Rubicon's Rock Rails but got a very good deal on the Warn ones, which bolt onto the same mounting points. They have been though 3 times, last time yesterday, and have saved things more than once.
So, the stock rails are very good and adaquate for most. Jeep had their act together on them. However I and at least one other guy can attest that just a little more protection may be needed if you spend a lot of time in the rocks.
BTW, I still have the stock ones cluttering up the shop. Verrry good deal if someone can get to West Sacramento. I'll keep them until someone comes and gets them. PM me if interested.