I recently completed construction of a metal body biscuit resonator. Came out very nice and sounded pretty good with the cheap cone I used during construction. Because it turned out well, I sprung for a Replogle cone. Installation was fairly straight forward and I only had to trim the bottom of the maple bridge to get the action back where I wanted it.
After reassembly and tuning I checked it out.
The first thing I noticed was volume. This cone produces a good bit more volume than the old cone.
The second thing was the brightness. Every string rang out clear and bright. Chords in open tuning are much more distinct and sound much cleaner.
I have a Beard cone on one of my other resonators and wanted to try the Replogle. It is a great product. I think a bit brighter than the Beard. I would definitely recommend this cone for an upgrade to any stock cone.
Thanks for a great product.

After much debate I bought the Replogle 9 1/2" cone to replace my worn out National Hot Rod cone. I'm glad I did it. You can really tighten your biscuit down. Then the tone and volume are superior. Not as bassy with better treble response. Although it's not as bassy it's also a lot clearer. The treble is nice bright but not to bright and no shrillness. Much more sustain. I always swore by National cones but I also used to swear by cigarettes. As long as it last as long or longer than the three months I've been getting from the Hot Rods I'll never go back.

Got the Washburn R360K and immediately followed reviewers' advice to upgrade the rather bland cone. Just sounded like the difference between old and new strings while finger picking--until my roomies were gone and I was able to bust out the finger picks and slide. Holy crap!! The thing barks and sings in a clear, bright voice. Finger picks and slide on the original cone sounded dull and lifeless. This is just what I was hoping for.