I had Windows 8 RMT Enterprise 9200 installed and activated (during online of KMS-server), but had to re-install because of non-working apps (see thread Windows 8 Apps not working anymore?. So I know the difference between being unactivated (start first installation), activated (after KMS was discovered) and inactivated again (after re-installation). I didn't try to activate again, as I wonder if activation had that much benefit. I can see more benefits for being in notification (not activated) status: 1. Not the need to reactivate after 180 days. 2. Not dependent of present of even absent KMS-servers. 3. Windows will run "forever". 4. As far as I understand: also no problems after the official release of Windows 8. 5. No problems after re-installations. 6. The same functionality as the activated Windows. There is however one downside: the options of Personalize under Change PC Settings can't be changed, although most of them can be altered by e.g. registry tricks. But for me these options are not important to change. If I overlooked facts that it really makes worth to activate, please let me know.