I have one of the first generation electric systems that I am thrilled with. Since my 2012 was made the systems have improved.
I don't think the hydraulic systems are more reliable but they are capable of lifting more weight.
Nevertheless I can't see dropping $3-4 K on an aftermarket system, unless I was physically challenged and unable to level the old fashioned way.
I spent that amount to upgrade to disc brakes, but auto leveling does not warrant that kind of expenditure for me.
I just think that $3-4K would be better spent upgrading to a newer rig that came stock with auto level already.
Of course we all have different wallets/budgets, auto level is a fantastic feature so if you have an extra wad of cash you are looking to spend go for it. If the price doesn't give you pause, auto level is a fantastic feature.