I have express 9...there are issues. I can get work done, but the GUI is funny. Cursor changing when you move it over tracks. Playback is screwed up sometime, crackling, stalling. I have a brand new Macbook Pro. Not sure what is going on with the sound...Everything is quiet in monitors. (Not sure if this is a Logic express issue or Apogee driver issue not playing well with M.Lion.) (I tred my Apogee in Grageband and it seemed quiet there too....) But anyway there are some definate glitchs with express 9 in ML. I would go Pro, maybe or wait for X. (If there is one.) That's what I plan on doing. I think the Pro version works good in ML.