I would. There is no reason to keep X3 Studio installed. When removing versions of SONAR, it is best to remove versions before installing new ones.

Scook, Thank you. I thought maybe the installer of X3 Pro would check if you have a previous version like other installers
 

Each version of SONAR installs in a separate directory so there is no reason for the installer to check for other versions. Many prefer to keep older versions of SONAR installed for a variety of reasons. There is no reason for keeping the X3 or X3 Studio installed if upgrading to X3 Producer.

That is indeed a FABULOUS price to upgrade.
 
Other than you having a learning curve that might last a few weeks, you should be VERY happy with all kinds of functional changes since Sonar 4.
 
X3e has been very well received, and is quite stable.
 
There are lots of good free videos, as well as some good ones for purchase, and there are also well-written books that help explain a lot of the new functionality.
 
Fantastic to see someone coming from so far back to X3e.  You will have a blast.
 
Bob Bone
 

Welcome to the new millennium! I think X3 is the best version yet -- in fact, I've been wondering how Cakewalk is going to try to convince me that I absolutely must upgrade to X4. Everything is different, though: workflow, plugins, interface. With a new computer, and once you get used to it, you should be having a darned good time soon. (YouTube is your friend in learning how to get started.)

I think you'll be REALLY please with X3.  The learning curve may feel straight up at first, but stay with it.  You will be rewarded!!

"Upgrade to X3Producer" I puchased Late Sept 2013.
But Melodyne Essentials and Addictive Drums 2 makes it a real bargain.
 
These may or may not be part of the X4 upgrade.
Coming up on that date for X4.  Of course I don't know new date.
$75 US is 1/2 price I paid which was bargain.

I upgraded from Sonar 7 to X3.
Bit of a learning curve... but not as bad as thought it might have been.