I chose this keyboard because I needed to control Reason, 61 keys keyboard, 16 controllers, 2molettes, everything is programmable, plus it adds a MIDI interface to my mac at once with a single USB port, I plug the keyboard + sound module.
and m-audio, I rather trust since it's a little early to have made this type of keyboard (oxygen, radium, Keystation ...)

UTILIZATION

So there I am not at all agree with the reviews on this keyboard.
There's only to see that all users are satisfied with their Audiofanzine radium49, keystation49 & 61, oxygen, why would it be different radium61?

the quality of the keyboard is similar to that kind of keyboard, as well as Edirol, emu, and other competitors (in the same price range).
FatarStudiologic was obviously a better quality, but costs 3ou4 times more for a size and weight that has nothing to do ...
So for me, easy, manual very clear and very good quality keyboard, the pots and faders have an excellent qualitée (equivalent to a high-end synth NovationKS eg)

OVERALL OPINION

I use it for 1 year, I was not disappointed, great value for money (like everyone MAUDIO gear for that matter).
I tried a edirol and esi, and I preferr the MAUDIO.
if I were to buy a keyboard / usb I will take an m-audio no doubt.
ps: I do not bump MAUDIO