Vas,
I see that you also use Cubase 7. Many of the basic tasks that you do there are very similar in Sonar X3 just in a different place. For example, when you click on a wave clip in Cubase, it will open up the wave editor window. In X3 the same click will open the Loop creation/editor window. At first this may seem like X3 is missing that clip editor function but in reality, the track view workspace of X3 allows you constant access to edit clips ( split, fade, cut, delete, ect ) in real time without having to open up any additional windows...simply enlarge the track window and your there.
The workflow is very similar and you will be up and running in no time. If you like the track effects in Cubase, your going to love the Pro Channel in the Producer version of x3. Intuitive, graphically useful, and crazy powerful! The new pop out RTA graph inside/behind the EQ window is worth the price of admission alone. Its like having the Cubase version of Voxendo built right into the plug without having to open up anything....fast and sounds killer!!
Try it...give your self time to adjust to the differences...and you wont regret it.