Like most of their customers you can be one of the first to R&D these by installing them and finding their physical limitations and fitment issues.
Please report back with what steps it will take to be able to install them, etc..
Being that I'm working with engines of all types, I've seen a bit of their stuff.
The rocker type items don't always fit coming from the first couple of production runs.
If you have to machine things to install, the steel used in previous rocker stand types are REALLY hard.
If these are the usual 6061 used, they should tolerate street rpms and spring pressures.
This is not a bash, I have several of their rods and a forged crank in process now, along with many past ones.
I realize that a good portion of seeing any negative internet chatter might be as result of folks not choosing parts appropriate for the app.
Curious to see how these fare...
To me they look to be set up the same as stock rockers but adjustable. They have T's and look like c clips holding the rocker from falling off the t. The question in my mind is if the T is as good as the original GM or will they snap off?
Edit:. Now I see your point Dave, the pairs have a center bolt and could rotate. The originals had two pairs a supporting each other. Unless the base is grooved and I do not see it.
A sheet metal U shaped tray, like the stock units have, would stop rotation without machining. Just sayin'. The real questions are whether the arms are strong/ trunion bearings good, and roller smooth.
Their other aluminum rockers are claimed to be 6061, which is scary.
I've seen them hold up to cruising use on an sbc with 110/320 spring pressure but have no idea how much time they'll take at full rpm.
Previous failures WERE the trunnion bearings littering your engine, which can destroy your engine.
On other platforms than Cadillac, I've also noted the roller tips not very smooth, there aren't the tiny washers protecting the aluminum from the roller type, they aren't always perpendicular to the pivot trunnion (as seen by angled witness marks on valves, and wear on the roller), and on one occasion...an eccentric roller tip bad enough to cause a rocker stud to snap due to the solid cam's lash varying .060"!!