Yeah it definitely depends on application and functionality. If you plan to make things work the way DuroFlex joints need to be mounted, I would still highly recommend them. They are far superior to Johnny Joints in my opinion. Ballistic joints are great because they can be tightened as they start to wear out which is nice. Rebuild kits for either set are cheap.

Here is a link to my build thread on here from when I did the 4-link.
https://www.toyota-4runner.org/2986536-post394.html


Here is a write up I did regarding 4-link suspension. Has some good stuff if you want to learn more about linked suspension geometry and what things mean and some basic info on how to set things up. I never got around to finishing it, but I keep adding more to the first post every few months.
4-Link Tech | IFS OFFROAD

I probably put close to 20k miles on them when I sold them to @rkntoy . I replaced one upper bushing. I only ran one upper as well (made two uppers but only ran the upper passenger side). The bushing was getting worn out and I called MetalCloak and they said it was very unusual to have them get worn out like that, and must have been bad vulcanizing on that particular bushing. The rest of them were all in good shape when I sold them though.

Something else to consider is you'll have to drill out your link mounts to fit the 9/16" bolt instead of the 14mm bolts. I recommend you pick up some Ruff Stuff weld washers while you are at it. If you plan to wheel hard and smash the links, the links will hold up great but that energy will get transferred right into the link mounts and the bolt holes will get wallowed out in no time. Or get @eimkeith 's lower link mount reinforcements.