Ones and zeros are all its recording. Cant hit it too hard like a real analog tape machine, although you will get the better resolution if you track in the orange. The tape is just a storage medium like a hard drive.
The ADATS time has come and gone. They were cool when they first came out, but showed their limitations quickly. I know, I have 3 of them, and two are fucked up and not really worth fixing. But for the price now, they will get you started.
I wonder when ADATs and Mackie will be considered vintage? For that mid 90's sound?