Not for me.
I finally managed to get the tech preview to run under VirtualBox a few days ago. Mind, that wasn't the fault of Win10 - for some reason more recent VB versions will not run on some Win 7 machines. Eventually I installed VB under linux and Win10 came up fine. Or at least as fine as it can be. God, it is ugly. Nasty blocks of solid colour. Active tiles on the start menu doing things I don't want. I don't need constant news feeds, sports reports, share prices. So I deleted them all and was left with a large blank start menu. It doesn't shrink when there are no active tiles. OK. thinks I, so far my objections are basically cosmetic lets see if we can tame this with Classic Shell. Won't install. Compatibility issue, it says. But if you rename the Classic Shell installer (I called mine fred) it installs and works fine. Deliberately blocked with a misleading error message. That's just plain nasty. Ahh, well, it has encouraged me back to linux. I made the system dual boot to try VBox so now I'm slowly migrating data and apps across. So far there is nothing except games I cannot run under linux or replace with something equally capable.
And as for the Win10 upgrade prep that was recently installed, my firewall warned me something new was calling home but that it was allowed. Which means that it was something which could manipulate the firewall rules. So I've set it to block and we'll see where it goes from there (it is identified as "GWX Config Manager").