I test and use (the excellent ! ) FORSCAN on my Transit Mk5 2,5 TD with EPIC injection system.
I also tryed it on others similars models of Transit.
The first feedbacks :
From 1992 to middle 1997 models, it wasn't run and can't connect to vehicle (2 models tested).
But from middle 1997 to end of production, due to Euro II / EEC97 LDT compliance, it's run nicely. (2 vehicules tested) 
With the VIN number and the ETIS ford website, you can check the vehicule emission compliance level before any purchage.The DTC's seem's corrects and true. On one vehicule, I had a trouble code, and after inspection, it's effectively the good problem.
But resetting trouble codes can be a source of confusion. I dont know if it's only on french version ? But when you clear the code, you dont have any feedback and sometimes a failure message (but DTC's are really cleared).
The oscilloscope run well. The bolt up refresh rate look little slow ?
A great feature may be implemented : the boost sensor ?
Best regards.
PS : sorry for my English, I try to do the best I can.