I'm also a DipTrace user.
I find it very intuitive to use and the few times I've needed support I've gotten a clear, intelligent, and accurate answers.
I'll admit up front that I'm not the brightest crayon in the box. After weeks of trying to use Eagle, I just couldn't get used to their interface. It took me days reading the help system, following tutorials, downloading and running scripts, etc., and I still didn't feel comfortable with the software.
I did complete a project with Eagle, and maybe if I stuck with it for a few more weeks I could have become proficient. But, their unintuitive interface, and their strange pricing levels (160x100mm board = $750, next step is $1500?) and unwillingness to negotiate and intermediate step sent me looking for something else.
When DipTrace was mentioned on the AmpHour comments I gave it a try and completed the same project that took weeks in a single evening, even with creating numerous library parts from scratch. I was sold.