My aluminum rack was delivered last week & I put it on today.
It was not as easy as I thought it would be. The biggest challenge is understanding which BOLTS are which. I also found that on the frame by the rear hub area it was easier to run a bolt in by itself to clear out the threads.
I think I will like having the add-on. I do suggest to TT that they consider changing the instructions a bit. Maybe use images of the bolts shown in actual size.