Not sure what Facebook post you are referring too, but it almost goes without saying that a Lowrance is the standard for anyone serious about pro level GPS. I run the factory nav in the JK most of the time, but for topography I also have two Garmin 76C's with external antennas that are basically mini-Lowrance's.
I will say that the factory Navigation system in my 2009 is almost like it was designed by PlaySchool for kindergarteners. That is not a compliment on its ease of use, it's almost a cartoonish after thought. Definitely a city/urban centric system that found its way into an offroad vehicle. Hopefully the 2011-13 have a better system.