Just helped someone upgrade an HP Stream 7 tablet from Win 8.1 to Win 10. Had no problems and the process was fairly quick (faster than some previous upgrades/installs I've experienced) and the transition was also fairly simple. The only real sticky issue came when the response time for web connections were really slow. The tablet in question has a built-in Wi-Fi adapter that, while not bad, is not the best. The user was using a USB Wi-Fi adapter and Win 10 made both adapters enabled. Under Win 8.1, the user had disabled the onboard adapter, but Win 10 re-enabled the adapter. I just disabled it again and everything was fine and back to normal...
Regarding the mining of user data, almost any operating system or software, not to mention websites, engage in some level of such data gathering. If you think by avoiding one or another application you're going to prevent someone from getting info on you, you are indeed naïve...
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