I've installed these SVC UCAs.
I posted about it in a thread on live valve 3.0s.
To install these SVC arms, you have to drill through the upright to give enough space for the 3/4" bolt. This is NOT mentioned on their website, and frankly, should be. That said, they were SUPER helpful when I was going through the process. Drill with a step bit. 3/4" end diameter (obviously).
I will have to see how they hold up to the elements. I'm in Vancouver BC, so lots of wet weather here.
The main advantage to these is you can adjust alignment while locking out the lower slot (which on stock raptors is just held by the torque on the bolt). I used the KHC stage 1 kit. I drive my truck pretty hard, so if that isn't your cup of tea, you may not need this type of set up.
Incidentally, I was really really close to proper alignment just doing it in my driveway. I had 0.00 toe both sides, had caster pretty much perfect (total fluke there, other than adjusting everything fairly even on all 4 points) and was just off on camber on one side by 1 degree. So bottom line is that with the UCA adjusters for caster and camber, it is actually really easy to align the truck.
I have 5.5" backspace rims (Venomrex 17") and these fit fine back there.