At the moment, I'd say personally that Windows 10 build 10074 is significantly worse than patched Windows 8.1 with Classic Shell by a LONG way.......
I have found it really unstable, e.g. hangs at shutdown (and this is with no additional software installled!!!!), long lags in the UI/explorer....
Am also seeing the following message: No lucky Not online server found,try later Am using KMS Pico 9.03 beta on Win 8.1 x86 Enterprise