I second Karl's vids, and definitely Scott's book. I moved from Sonar 6 to X1, and X1 Power was a godsend.
I also recommend Eli's Groove 3 X2 videos. I have them and they're very good.
Good luck and have fun. When you get the hang of X2 the workflow is so much better. I love it.
Post any questions you have as there are many very knowledgeable, and helpful people on here.