In my personal experience, it's always worth it to use the recommended antifreeze.
Several years ago the water pump on my wife's 4.7 went out, I went ahead an replaced it with a new Cardone unit, and decided to flush and fill the coolant at the same time. At this time G-05 wasn't readily available, so I used Peak Universal Antifreeze. All was well, until 4 months later I noticed the water pump leaking again, so I went ahead an warranteed it out and again used Peak Universal AF. Like clock work (and in the middle of winter), the water pump started leaking about 4 months later. I was able to determine that it was the gasket that was leaking and not the weep hole. I replaced the Cardone gasket with a Fel-Pro and within a couple weeks it was leaking again. So I pulled the pump a fourth time and replaced the gasket with a Mopar, once again within a few weeks, it was leaking from the gasket.
I ended up flushing the coolant and draining the block, pulled the water pump, replaced the gasket with another Mopar, and refilled with G-05 and distilled water mixed 50/50. It's been about 3 years since I last opened up the cooling system, added coolant, or had a leak from the water pump. Even if I had 'overpaid' for coolant at the dealer (vs. using G-05), it would have saved me lots of time and money in replacement gaskets, coolant, and water pumps.
My only complaint with G-05 is in my SRT4, since the coolant bottle sits so close to the turbo it has discolored a bit and it makes it hard to check the coolant level since the coolant is lighter than the bottle.
His: '00 WJ 4.7 Limited- stock
Hers: '03 WJ 4.7 V8- IRO 3", 245/75/16 Duratracs