So after putting some miles on the rack, both local and highway, I think I can say that this rack is super solid. I did a number of hard pulls, hard stops, and put some strong lateral-Gs on it all while loaded. I even kicked out the rear end of my Mach E at least once.
Not even a wiggle.
I'll still need to see how it holds up long term to Michigan weather, but for now I think I can safely suggest an 1UP rack if you are in the market.
I purchased the heavy duty model by the way. Not technically required for my current bike, but I wanted the flexibility in case I ever wanted to add on a second bike or an e-bike.
The only issue I've had so far is that, depending on how the bike is loaded, it may interfere with the blind spot sensor. I can avoid this with careful loading.