Let me start by saying Im new to mesa-boogie. I've used marshall for all my dirty sounds, and a 6505+ for my leads. I decided to broaden my tonal palette. I guess you could say I had a serious case of "gass" (whatever than means But after I've spent about 2 months with both. Im confident in saying that the roadking beats the mark iv in every aspect. The cleans are more bold and colorful, channel two is great for blues. Channel 3 gives me a GREAT JTM like crunch. And channel 4 is amazing. All in all I think the RK has was more versatility and all together has a more colorful tone. :mrgreen: