I installed mine in 2022 while running around in Zambia and still doing the same more recently and regularly in Joshua Tree. No issues. Do be aware that the rear tires swing up and backwards in a gentle curve by design. Take note of how far forward they sit in the wheel well so you can duplicate the factory setting.I had no idea such control arms existed. $650 is a chunk though. Those junkers I buy on ebay are about $70.
If I could get one of those Iron Rock arms to last 2-3 years that would probably be worth it though, factoring in my time/downtime, etc.
I don't "offroad" but I have a RHD Liberty that I used on mail routes for 3 years. (Im putting it back into service) Around here the routes are long and rough and nothing holds up...