So this is what I experienced.
I've been on insider program for over 6 months now but for windows mobile. This is the first time I've tried with pc.
Download took about an hour. Installation maybe about one and half hours. After installation, lock screen had no picture. On logging in, Kaspersky Internet Security was semi disabled. I tried enabling it but no luck. It asked me to reboot so I did that
After rebooting, whenever I typed in start, nothing would appear, no typed words nor results. I restarted again. It got solved but now the surface cover wasn't detected.
Restarted again, cover got detected but Kaspersky is still snoozed. So I uninstalled it and then tried installing it again. It wouldn't install at all.
So now defender is running. Everything else seems okay. Did the dark theme. Lock screen images are back (spotlight).
One annoying thing is apps that I had removed like MSN news and health were reinstalled. I removed them again.
Second thing is about 10Gb has been used up and is in drive C as windows old. I'm guessing this is the 10586 official version which I shouldn't delete until redstone is officially out.