Question for those 'in the know'. Is there really any significant difference between J2534 tools such as GMs MDI, OTC's tool (Which I think the MDI may even be built on), the Dearborn/Autoenginuity tool and the DrewTech CarDAQ? I know some tools like the MDI and OTC support wireless connectivity, while the others don't. Are there any other differences that make one really better than the other, or are they all more or less the same?