I used to own an M-Audio Oxygen 49 Controller. One of their cheaper models.
It was the biggest piece of crap I've ever played. It would skip notes like nobody's business unless I turned off velocity.
I've since replaced mine with an Alesis QX49. Light years better. The keys have a great feel and it hasn't skipped a note on me once.
The QX series is discontinued but has been replaced by the VI series. The VI series also has real MIDI ports as well as USB and can be powered by an optional AC adapter.
You get what you pay for...
Caveat emptor...
Gary