I have spent the last couple of years using Maya and the company I work with now uses Max. I am a Game Designer, so I haven't had to do any 3D work since I got here. I have, however, decided to take it upon myself to learn to use Max, to hopefully do some level design in the future in Max. The thing that is bugging the crap out of me is the whole middle mouse button for all navigation, and using the Alt and Ctrl key to change navigation types. In Maya you use Alt as your navigation key and the LMB, MMB, or RMB are what change the navigation type. In essence, they're basically flip flopped with each other. I found some $50 app that would let me use Maya style navigation, but perhaps someone here has a better alternative?

One of the artists where I work uses Switcher or whatever it is called (the app you are probably looking at), well worth it, he says. But you'll still have to learn Max's crappy way of doing many things.