Nothing really to add, they were very easy to deal with. Shipping wasn't cheap but I knew that going in.
I wouldn't say it did nothing, it helped a bit but it definitely didn't solve the problem. The seat was more level than before, yes, but it still had a distinct downward slope toward the tank. See the picture I attached of my bike. I ordered a Corbin seat a few hours ago, very keen to see how that feels.