The M-audio Axiom Pro 61 is a fantastic keyboard. It is easy to use, especially in Protools and Ableton Live as well as several other DAWs that utilize the HyperControl feature. The keyboard has no built in sounds so you need some form of virtual instruments and given its size it is not the easiest to tote around. If you are looking to gig with this keyboard you will likely need a laptop and an audio interface to use with it unless own another device that can send through its Midi In port. The keys are semi weighted and support After Touch which is a great additional feature.
This keyboard is easily one of the most fun to play midi controllers around and I would highly recommend it.