Just tamed a lvl 120 Argy! Took me about 4 days (game time) to tame and he is worth every second that I waited. He is very good with transporting animals back in forth and packs a pretty good punch. I highly recommend this animal as a must have tame. He has a really good wait reduction and is great for resource runs. I highly recommend that you don’t try to tame one in the Tundra with clothe armor though; not so fun.
Getting a massive TLC update in March 2018. The saddle will act as a mobile smithy, Argentavis will be able to carry with Talons as well as with its beak, reduced carry weight on obsidian and a few other unannounced resources (similar to the mammoth and wood), and will also gain a Rapid HP Regen upon eating (likely from devouring corpses and not specifically food from inventory). Like so people can see!