i have a 6 knob stackable one and have tried the 8 knob i got the 6 knob for 240.. and the 8 knobs were going for 360 so i went that route the extra tone shaping is nice, the pres control on the blue side makes the blue sound more marshally and it is nice to be able to tame the highs on the fish factory but i really like the 6 knob and it gives me less to fuss with
Had both...8 knob all the way...super tweakable and amp friendly...the 6 knob was tough to dial in on the RS CH...very narrow sweet spot on the tone knob...the Presence knob on the BC CH is great to have as well...