I have a DP Tuner in my yellow truck, have had it for about 3 years now, very happy with it. Like they said, each one, be it DP, TS, TW, or others, send altered info to the trucks computer to make it run diffrently. The style of the info sent, and how it's altered, is the diffrence. I have not used the TS/TW chips... but the DP Tuner in my truck has done well, it has an 80 hp economy tune that I run 98% of the time, which is a nice boost in power, and I picked up about 2 mpg... also has a deceleration tune, which locks the trans torq converter, and helps in compression breaking when going down hills, or slowing down in any fasion.
I have an Edge Evo on the Excursion, it was there when I got it, I don't care for it, it makes the trans shift hard on full throttle acceration, plan to replace it with a DP Tuner when the funds are availble. From what I understand, the edge does not change or take into accout the trans programming, only the motor, where as the DP does, it alters the trans as well as the motor together, as a complete unit. With my DP, the 40 hp towing tune changes the shift points in the trans, as well as lowers the power from the motor, and progressivness of the throttle pedal. It's nice, shift on the fly, from Stock, to hi-idle, 40hp towing, deceleration, or 80hp econo...
Just make sure you got your gauges in, and pay attention to them...
'99 E350 DRW Stahl 11' util box van, 7.3 PSD, stock. 138k SOLD
'00 F350 extcab, 9' utility bed, dually 228k
E'99 F250 extcab, S/Bed 211k. Sidelined due to motor issues.
'00 Excursion Limited, 7.3PSD 294k
'84 Chevy K-30, 6.2L TD, woods/trail beater. 141k