My bass drum has never sounded sweeter.
I usually jump between high and low tuning a lot depending on what style I'm playing, and the kick port has added so much more dynamic to my overall sound.
From the highs, and mids, to the low tones, it accentuates, and gives an epic punch to every stroke of the bass drum.
I honestly don't know how I managed before it. Such a small, simple, piece of hard ware, that makes such a huge change to the overall projection, and quality of your bass drum.
If you use either a single kick, or a double kick, it will accentuate with ease, and you get no muffled sounds at all.
A must have for every drummer, and I will be recommending it to all my drummer friends.