I did an upgrade install over 9926, using a dual boot set up with 8.1. Unfortunately the stability issues were a bit much, so I am waiting for an official release from MS. It's possible a clean install of 10036 would have been more stable, but reading the comments by some who have done the clean install path & still have similar issues, I think waiting for an official build is the wisest choice.
I had upgraded a VM and didn't have to reinstall any programs I had installed. I use 9926 as my main OS on my laptop, but still use VMs to test stuff out.
Have been using it for half a weef as main OS, perfectly stable for me as it is, the only issue is when shutting down the pc, explorer sometimes gives a memory read error. Other than that, I'm fine with it, on an FX-8350 4.95 GHZ/1.56 V
Now I installed 10041 in my own language. I think from today I will be using Windows 10 as my main operation system. I hope everything will go well.