Thank the Lord we have till 2020

I am a little concerned about my refurb biz since all this talk about Windows 10..........I have never even sold a computer with Windows 8 because of all the negative feedback it received............I use Win 7 for everything do...........It is so simple and straight forward........Anyway to get to my point I downloaded the Win 10 Tech preview and from what I have seen I really don't have much to worry about...........I know its a preview but it was sluggish and an overall Pain in the Butt to use..........When I first loaded it "Cortona?" or whoever the narrator was wanted to narrate my every keystroke........Talk about annoying........Oh well this is just an extra machine I am using for research, file sharing etc and I have already deleted the preview and back to Win 7.......The computer runs fine with 4GB ram and 2GHZ Core 2 Processor (I KNOW NOTHING SPECIAL)........Anyways anyone else tried this preview?........I will continue to direct my clients to Win 7 and make sure they know we have support at least until 2020.........I know Linux is out there and I am going to try it next but not sure how it will go over with the people buying my computers............Sorry to be so long winded just trying to stay ahead of the curve (a little bit)