Sweet, I was so right! I owned a 5150 for two years and have played through a 2-channel Triple Rec. extensively recently, and the SLO was just process of elimination!
I have a 5150 and an SLO and it's been my experience, maybe I am carzy, that the SLO keeps up with the right hand a bit tighter. I like the combo of the Mesa and the SLO myself also. I need to look at getting myself a dual channel Duel Rec!!