So I just unboxed a Kustom kxb500! Here is the deal. This amp feels as loud as my Streamliner 900 and Markbass little Mark tube 800. This is a reckless statement since I have not cranked it up all the way yet, but I could not play it with all knobs at noon with a passive p bass through my Genz neox 212t in my house without feeling like it was going to shatter something. The eq is simple and the lack of mid options is actually refreshing so I can't worry about fiddling. The tube is noticeable at barely on gain through all the way up without breaking up into facemelt territory like an orange bt or Streamliner. The Markbass lmt had horrible tube breakup that was not pleasant. The response of the amp is tight like an Aguilar tone hammer without the dryness and not quite that tight. It is definitely tighter than the Streamliner. It is more like a Markbass amp but without the level of baked in warmth across the spectrum that makes it hard to cut with. It is also smaller than I was imagining. The knobs feels quality and have good resistance except for the mid knob which is loose (it's a 500 or 700 hz pull out option). It's is Tubey without being amorphous. It seems like it will cut through really well in a mix kinda of like a shuttle but not as clinical and oddly voiced (I never enjoyed my shuttles I have owned even without getting to the filters). So that's it I have played every amp ever made (not true but I've played a good number) so if anyone is wondering about them I can try and respond with a thought or two comparing tones. I'm diggin it.