I have not yet reached far enough along the learning curve to use X1 or X2 productively. It is a serious slow down for me. If I have a time critical project, I revert to SONAR 8.5. Things not only changed considerably in the revamp to X1, there are things I absolutely cannot figure out how to do yet.
Just the other day, for example, I could not move a small clip from one track to another without the smart tool jumping into an unwanted mode no matter what tool I specifically selected or area I tried to hover over. Sometimes the very moment I clicked the mouse, the tool would suddenly change. Re-sizing the view, selecting the specific tool, altering various apparent settings, I had to remove all envelopes from the track before being able to move 4 small clips from one track to another. Then I had to set the various envelopes back up. I have no idea why I could not move those clips. That is something I do on occasion in 8.5 without even thinking about it.
Another odd thing I keep running into is that every so often "all bins of this type are bypassed." And this is without my having even tried to bypass anything, it just suddenly starts happening and I notice various FX are no longer in the mix even though they are "on." I must have unconsciously touched a key or something.
I have been using the SONAR XI power book to guide me into the learning curve. I went from Pro Audio 9 to SONAR 1 without ever having to pick up the manual. And I doubt I ever looked at the manual for each of the updates through to SONAR 8.5. But with X1 I feel like I jumped ship and as if using a product that is only similar.
I still like X1 better than Pro Tools 10 in spite of being able to work more quickly in it. I use PT 10 at work.