I have a little M-audio controller keyboard and I love it...

it's not only a keyboard, it also works as a control surface, audio I/O interface and MIDI I/O interface. I don't know if your model has the audio I/O.. but if it does, that alone makes it worth the money.

It definitely offers MIDI I/O at a price that is comparable to many MIDI I/O only interfaces. Plus you get the control surface, keyboard and possibly audio IO thrown in at no extra charge.

Ask the current owner for whatever software came with it. M-audio typically bundles software with their products