Hi,
Of course there can be no difference in "quality" of actually programming the part, either it gets the device programmed or it doesn't.
I guess what they mean is that the hardware and software may not be suited for automated programming or gang-programming in a "real" production environment doing thousands and thousands of "cycles" per day. If you're doing "bench production" I'm sure it works just fine. After all, the PTG-function is quite nice for repetitive flashing of the same firmware (it's just too bad that the PK can't be powered from the target when using it).

/Henrik.