I have both the 805 and Buxom Boost. The 805 does a great job adding a touch of compression, tightness, and saturation with all EQ settings at noon, level max/drive min. I usually turn up the bass knob a bit to get back to baseline with the low end, and sometimes turn it up pretty high for a fat sound. The nice thing I've found with the bass knob is it rarely gets boomy or muddy on extreme settings, just really fat and round. Still, if you turn down the bass, yes it tightens things up but also thins out your tone. This is where the Buxom comes in...
The tight knob on the Buxom Boost takes the cake. It really allows precision control of your low end attack, and when combined with the EQ knobs I can get exactly what I want. In theory (depending on the amp/cab/etc) you could crank the bass AND the tight control and get a wildly thick, tight chug thing going on if you so desire. It is a clean boost so it has hardly any color, if any, compared to the 805 which is still relatively clean for a boost but definitely has it's own sound. Sorry I can't directly answer your question but I hope this helps!
