I have both the Nektar Impact LX88+ and Keystation 88. I bought the Nektar because I wanted to have a controller than integrated nicely with Logic and Cubase (transport controls, mixer, CC's), and it does a wonderful job at that. IMO, it's a much better controller, and I prefer the action over M-Audio (feels smoother to me). Aside from the goofy old school LCD display, it's a great controller and a great price and also has some cool pads that can be assigned to anything you want. Not long after, I got an awesome deal on a brand new NI S88which is now my primary controller. However, I still have the Nektar set up because I use it for playing parts that need faster response (synths, fast strings, etc).