I have been running Digilite on my windows 7 64bit PC, using a HVR1300 WinTV card for some time and it works very well. However attempts to use a WinTV pvr2 usb on my win7 64bit laptop have been unsuccessful, due to driver issues.
But today I have tested a WinTV-HVR1900 on the said laptop and it works fine, the best setting in Digilite config was to use the standard PVR option not the HVR one. I had expected to have to wrestle will settings but it worked straight away.
So another device to add to the working device list.