I've run MS for around a year now. With some intelligent mapping (ie, read the manuals properly and think about things before pressing buttons) you get very good results. My AFR is spot on now in all conditions, and it delivers power very smoothly with decent throttle response.
Im not saying DTA is shite, but its far from being better than MS.
Studabear, have you considered using megasquirt to control your boost via a solenoid valve? MS2 will do open and closed loop boost control. I will be testing this function over the next few months.
Rob,