I'm happy with my DP tuner, though I havent used another brand to compare it too. I have a 2003 e350 7.3 w33's & 4" UJOR lift, 4" exhaust, mag tech tranny pan. I did 80econ mtn and it's awesome for living at altitude and driving passes. Nice to switch to regular 80econ for lower elevation I sent my Original F5 back to Jody at DP after he did some live tuning with Chris at Ujoint. The new UJOR tune is far superior to the original, as the shifting patterns are way better, especially around 40mph or 1300-1600 RPM. If you do get a tuner, I would also suggest monitoring your transmission temp in addition to EGTs. High idle is nice to have for cold mornings or running accessories. don't notice a hell of a difference with drive-thru setting, they still can't hear me unless I'm yelling. Let's face it, the 7.3 van is a loud beast.