The old Argo rims did not have a good bead lock so they are nothing to compare to. The fact that you said the tires seated easily is a concern. Try mounting a new tire on a Max bead lock k-rim and you'll thnk the tire is going to explode before the bead seats.
I remember years ago when we'd have a big 6x6 ride at Deepwater. An Argo would have a tire off the rim within five minutes of riding. This happens mostly when riding in an ORV park that has ruts narrower than the Argo. One time a guy had three tires off one side of his Conquest and every Bigfoot had at least one front tire off. It was a miserable time for those rims. Max upgraded to the K-rim in 1999, a great bead lock rim made by Kawasaki. I have ran tires flat with the valve stem tore out and the rim still holds tight. The k-rim is a steel rim with black powder coat for only $53 from Recreatives. Well worth it.
Everybody dies, but not everybody lives.