I turned off all the available options during the install. No, I don't want MS to be kept informed so that I only see relevant advertising, I have Ad blocker installed. I don't need to tell them which URLs I read either, so I have Disconnect installed. (The latter speeded up performance of the BBC News page enormously since Auntie started monitoring which of their articles won most readers). I do worry about nosey old Microsoft, and nosey old Google, and am a bit concerned about Facebook's ambition to tell everyone everything about everyone else but what the heck, my whole family tree is published on line and my mobile phone will tell anyone who wants to know where I am and probably who I'm with. However I live in a rural French village so I have no secrets: most of my news is known throughout the population before it reaches me, and I like it that way!
Btw, I have installed Windows 10 on all my Win 8.1 laptops now except the one in England, only my own Win 7 machine is awaiting the download but as the home network is working fine and all the necessary data files are visible to all machines, with One Drive files shared successfully, I'm in no rush. Both the Swann CCTV systems are controllable from all laptops as are all IP cameras in UK and France. Logmein is working fine on the French and UK hosts.
Only slight problem was fixed by a chat with Microsoft and arose from installing Office 365 following upgrading to Win 10 on a laptop which already had Word and Excel 2013 installed. I didn't want to lose the original licences in case we don't continue with the Office 365 subscription, and since the upgrade neither installation of Office appeared in Apps (and desktop icons disappeared) so couldn't be opened. I reported this to MS and was advised to find the programs in Control Panel, Programs and repair Office 365. This did the trick and safeguards my licence while enabling me to use Office 365.
Can't quite believe how easily this rollout has gone.......