Install complete today. First some perspective. I had a 2002 Tahoe with 8volt eclipse head unit and amps, JL sub and MB Quart component speakers. It was a solid setup that had some serious punch. The stock Denali setup was pretty good in the upper range but of course lacked low end rumble. The kicker sub after only about half an hour of listening does provide the missing low end that the system desperately needed. I imagine as the sub breaks in it will only get better.
As stated in the other review, this unit will not rattle the windows out but it does vibrate the rear view mirror a bit and compliments the stock Bose system well.
I would recommend the VOX app as it is CarPlay compatible and allows you to play FLAC files would sound much better than the standard MP3 files.
A side note, Kicker now lists their part number for this kit on their site and another kit with the sub and additional amp/dsp. Part #PSUTA15. No instructions yet as it is not yet released.