There is a lot of information in the X1 video that can be applied to the X2 for mastering. So the answer is yes go ahead and watch it and take notes. I purchased the video in the cakewalk store back when I had X1. Lots of great tips.
Since you are over at groove 3 checkout Sonar X1 tips and tricks. like the mixing with Sonar X1 video this video has a lot of great information that can be applied to X2. I know you only have a month but I found the following videos very informative.
EQ explained
Compression Explained
Zeta 2
Ozone 5
Mastering in the box
These to me were the best ones for opening up the possibilities in Sonar.
I also liked
Synths explained
UVI workstation
Sample Tank
Studio Secrets
Kontakt
Reverb explained
Jazz explained
Song theory explained
Music theory explained.
That is as far as I got for 1 month. I went through the other videos for a brief overview but those seem to be the best ones in my opinion.