mechy, can you print things like Final Writer documents and Draw Studio vector images through the netprinter.device, or is it only limited to plain text?
Only the underlying printer driver matters. All NetPrinter does is redirect output to the network instead of the local printer (i.e., parallel.device). Think of it as a more transparent and versatile implementation of CMD.
So, yes, you can print anything through it

I use it with a LaserJet4Plus. Works great.