The ones that I am looking at are from the HF series "Hybrid Forged" meaning that they should be lightweight and strong. From a weight perspective, I think when I looked this up, the stock wheels for the TRX were 30 lbs (assuming that there is no changes between what we get w the RHO). For comparison, an equivalent 18" from the Vossen HF series will be around 29-30 lbs also. 20" wheels are ~37 lbs and 22" ~45. From that perspective, comparatively against most cast wheels they would be lighter and allow you to keep a lot more of the OEM performance depending on your choices in the wheel and tire setup.
For me personally though, I wouldn't be even considering them if they didn't look good, but I know that this is subjective. I don't plan to be doing much off-roading in this truck, and I have a Jeep I use for that kinda fun. If I were though, I might be looking at something with bead grip technology, like in Method Race Wheels or just straight up beadlocks.
I think the stock look on these trucks looks damn good too! I'm just a junkie for changing things on my vehicles and too far gone to try and put that cat back in the bag.
