Midbass punch and vocal clarity is one of the things I listen for. Distortion in the 50Hz to 200Hz range tends to manifest itself as deep vocal heaviness, since it increases output in the range from 100Hz to just under 1kHz - right where the vocals are. Most of what's played on piano is there, and really, so are the fundamentals of most instruments. So even when a woofer is crossed over at 200Hz, I think that makes it responsible for an important part of the audio spectrum and not just the bass foundation.

I haven't listened to the Dayton woofers, they may really sound good. Maybe their distortion levels are very low. Even if they generate a little more distortion, that may make vocals "warm" sounding. I don't mean to voice an opinion on what drivers are better or worse, just that I can really hear the difference when an improvement is made in the audio range the woofers are covering.