I've got a standard OS Mesa cab and a traditional sized Avatar cab that I use with my Mark IV (which has a similar tone to the JP2C), and it really depends day to day which one I like more. They both have their strong points. The OS has that big wall of sound and a lot of thump to it, but the traditional sized is tighter, more focused, more mid forward. Yesterday I was playing thru the Mesa OS and it sounded killer.