Only the 3G models support the PSVSD. You do have to fiddle with the drive setup, some of the adapters don't work with some FW versions, etc. It's just more of a pain IMO than dropping ROMs on an SD card like other handhelds.
Also I just ftp and drop roms on the sd card too.
To get the mod working I had to compile the software for macOS 10.13 as some libusb function wasn’t working correctly and wouldn’t inject the payload to the vita. This was well out of my comfort zone.