Yes I have owned a few M-Audio controllers..

I did use an Axiom 61 for a while..I never could get the sliders to do the draw bars for B4..

The keys were a little strange to me.....hence I did make a change to the EMU Xboard 61...This controller has 4 zones, and is more feature laden then the Axiom 61..and yes ..my favorite semi weighted key feel...although only 61, for the most part..61 works as a controller..

I purchased the M-Audio Sono 88 when it came out, and I thought it was a great value..The keys feel was good, and it came with several "premium" sounds as well as 128 GM sounds...Making it double as a stage piano..It also has a USB audio.midi interface with a mic input too,,separate volume controls for the sounds, the audio input, the mic input...

One of my girls in the band uses it on stage now...

BTW: EMU has folded tent apparently....no longer ..

There is a new Axiom Pro model, but it is pricey..

The early M-Audio models I did not care for, and yes they had a track record of returns...