I bought a Sony MD-N707 not too long back which I'm using as a nice way to chill out without screens, and for recording Shortwave radio overnight off a Sony ICF-SW7600GR world band radio. The MD-N707 has a cool maintenance mode feature accessed via a Konami code that lets you patch an EEPROM to enable features from other models.

My only gripe with NetMD is that you can put things onto MD from a computer, but it's an analogue trip back for recordings. This was an architectural decision due to DRM restrictions. One day I'd like to have a go at trying to bypass this, but it looks like a massive pain in the hole and I only have one MD recorder.