I've just scratched the surface, but I like what i've seen so far.
The download and instalation process was trouble free. I've never had any issues with the Cakestore. (Using it since sonar 7)
My serialnumber was in my account atter a few minutes.
I'm allready in love with the popup EQ and the new color management. (Oh, and the ARA/Melodyne thing looks very cool)
I'm one of those guys wit almost no 3rd parts plugins, so I think the uppgradeprice was very fair.
I was planning to buy a new drumprogram, but now I've got a superb drumprogram included with my Sonar uppgrade for almost the same price as just one drum softsynth.
Looking forward to test X3 more, but so far: I'm a very happy happy Cakewalk customer.
Thanks Cakewalk