You seem to be having my X1 experience. X2 on the other hand couldn't be working better though there are a few minor glitches that have already been reported.
I encourage you to be patient.
With X1 it took the release of X1C before I had a useable product. Nevertheless it seemed obvious that my experience was in the minority as well as a first for me; having previously not had such major problems with any release in over 15 years..
X2 has been encouraging as I seem to be back to my previous SONAR stability. Might add that its the same machine on which I've run 8.5.3 as well as X1 and now X2.