I can't say much for their handling off-road, as I'm sure it ain't great. I installed the ADDCO sway bar kit back in February this year (I removed the XREAS about the same time in 2017).
After a year with the weeny stock sway bars (keeping in mind that as far as I know, the Limited V8 has the "biggest" stock sway bars)... the ADDCO bars are a dramatic improvement in body roll management. Passengers no longer clunk heads during hard cornering. Rave reviews about the handling from others that drive it. Its ability to corner instills a bit more confidence than what is likely prudent given the tendency for the BFG AT2s to hold on under duress.
I have 6110s up front and 5160s out back, MOOG stock length springs rearward. Front shocks are on the "lowest" perch setting, essentially a leveling lift.
Anyway, something to note is that the ADDCO bar up front, atleast at my ride height, contacts the oil filter under hard cornering. I use a smaller filter to address this. I don't know what filter number/size it is off the top of my head.
All in, it was heinously expensive to do... probably $1200 CAD parts and labour. Absolutely worth every penny considering how I use the truck.
To sum it up, the ADDCO kit accurately reproduces the solid cornering the truck had with the healthy XREAS system (and installs all the downsides of heavy sway bars, unlike the XREAS

). I wouldn't want to return to the stock bars (although I did keep the stockers).
Let me know if you have any specific questions and I will do my best to answer.