Well - I have three concerns with Windows 10...
First: Some hardware will simply not function with the new Windows 10 model drivers.
I am one of the "victims", because my Focusrite Saffire (white standing model) and Firewire card combination that works perfectly under Windows 7, just plainly refuses to work under Windows 10. As an new audio interface with the same number of I/O is outside my budget at this time, I will stick with Windows 7.
Second: automatic updates that cannot be blocked by the user.
Already some people with Nvidia cards have had lots of problems with this one. I can imagine that some driver updates can cause havoc, because you have older hardware and newer drivers just do not work (as is my case).
Third: Privacy concerns.
Even when you disable all possible data send to Microsoft and create an local account only, there is still lots of data that will be send to Microsoft, if you like it or not.
Read this article:
http://arstechnica.com/information-technology/2015/08/even-when-told-not-to-windows-10-just-cant-stop-talking-to-microsoft/?comments=1 One of the comments on this article about the ULA makes me especially suspicious. I citate:
"Content. We collect content of your files and communications when necessary to provide you with the services you use. This includes: the content of your documents, photos, music or video you upload to a Microsoft service such as OneDrive. It also includes the content of your communications sent or received using Microsoft services, such as the:
- subject line and body of an email,
- text or other content of an instant message,
- audio and video recording of a video message, and
- audio recording and transcript of a voice message you receive or a text message you dictate."
I wonder how much insight Microsoft has in the creations and documents from my clients stored on an Windows 10 computer. This kind of things makes me feel unsafe to say the least.