Am I missing something between build 306 and X2a?

I am running build 306 and everything works great and I have no performance or stability issues.
Are there major features or improvements in X2a that I am missing out on? 
I generally don't like update patches unless I have an issue and at the moment, I have none. I do miss the accessibility of the Tap Tempo from the earlier Sonar versions. It seems in X2 you have to go to "Insert Tempo Change" in the Project menu to get to it.
Is there a button on one of the toolbar modules I just can't find?
 
Thanks in advance for any insight
 
On an unrelated side note, I have used Cakewalk since the DOS days and have yet to be convinced to switch to anything else.
Several friends of mine use ProTools and it seems cumbersome. Probably more me not being Mac savvy, but the workflow in my studio is way faster and smoother than my Protools buddies. The end results are both great, but there seems to be a warmth to the SONAR projects that the ProTools projects lack.
Maybe my ears being biased?

HA! Thanks scook (and duh!...) for the obvious and easy to find link that I don't know how I missed earlier.
A lot of useful stuff there and once I finish my current project I'll be loading it.
 
Any insight on an Insert Tempo button on the toolbar? It's the one thing so far that I miss about the Pre-X Sonar.

You can insert a new tempo in the Transport Module in the Control Bar