I have used quite a few different models of Kingdel computers. They are very well built - I have not had a single problem. I discovered during a routine scan that one off the computers had malware and pups installed on it. I checked the prior ones and found the same thing. I stopped using them for a while but could not find a replacement product as good. As a result I started buying them again but taking remedial actions. As soon as I receive them, before even connecting to the internet, I run a malware scan, create a new admin account, delete the pre-loaded "kingdel" admin account and all related files and uninstall any software loaded (generally an old version of office).  I've never had a problem after that. Provided you are aware of the issues and willing to take precautions the hardware is great. I have not had any issues with the installed OS.