So far, so good. Once I was able to latch the Corbin seat onto the cycle and sit on it, the seat sure felt firm. After about 2 miles, however, the firmness went away and I was able to nestle my butt back into the mini backrest with comfort. I've already added my sheepskin to create a little more softness.
I have a little more work to do to get the seat to latch properly. Corbin tells me to remove the plate which holds the U bracket and use some spacers under the plate to make it easier for the U bracket to seat deeper in the Honda latch mechanism. I believe I can handle that.