Anyone who is using flats, a cab without a horn, or the horn off, or a cab with a hole in the mids, or those who roll off treble on their bass, will clearly notice the high level of bass on this amp, with the bass control at 12. Without a doubt.
When I compare it to my Shuttlemax 9.2, there is clearly a huge difference, and the Max is more 'defined' and modern, with less warmth.
But, and this is the big but for me, the whole idea of the Streamliner is to get close to the older vintage tones, where the tubes provided warmth and tube 'sag' so to speak. Many of the Fender/GK amps have exactly the same type of tone, (eg, with a dip in the mids). Recent reviews of the latest GK amps show a pretty huge mid scoop, which like the Streamliner, is easily rectified by moving the EQ a little. Then, there is still room to play.
Maybe its because I tend to use Musicman basses, and they just respond well to the ying/yang of Streamliner's tone, and the fact I use faily mid forward cabs. For me, it sounds fabulous.