Brian,
The digiprint is printed on what's called a printer cutter. Its the next generation for all kinds of applications. It's like a vinyl plotter cutter, and it prints. We are adding one to our shop shortly since it can do banners, labels, decals, static cling, and yes, t-shirts. It is applied to the shirt with a heat press. I almost got the
DTG, but opted for the printer cutter instead. We do lots of dark t's and you don't have to have any kind of underbase with this process. You can check it out at Stahls or the Roland website.