I didn't do an A/B comparison, so I can't tell you the fine details. Although, when I did do the break in period with the Daytons, I did have a smile on my face and was not noticing any areas where it was noticeably worse than the k-10-k drivers. I was impressed when I turned it up a bit with the low end reproduction coming out of a relatively small cabinet.
So, a person who poo poo's everything but Klipsch will probably find 100 things wrong with replacing the OEM driver with the Dayton. Everyone else will realize that it is a great replacement option. Plus I believe Parts Express has a trial period where if you don't like it you can return it. (Although I think too many people abuse these policies over the years, thus making products cost more in the long run)