After waiting several days for the Windows 10 notification app to upgrade my Dell XPS 8300 and reading the gloomy news on the Dell forums on which Dell systems had been tested for windows 10, I decided to proceed with to proceed with a manual upgrade. My system is a Dell XPS 8300 with 16GB memory, an AMD Radeon HD 6800 graphics card and a 2 TB hard disk. I use graphic drivers obtained directly from AMD.
The Windows 10 app had indicated no issues with my system so I decided to proceed knowing there was a change I might have to reinstall my old OS if it failed. Downloading and installing the OS took about 90 minutes and I have been trying different applications (MMOs, ms office, browsers, etc) the last several hours with out any major issues other than some of the Itune folders which had permission issues.
Other people have reported problems upgrading XPS 8300 to WIndows 10. I suspect the problems are due to specific drivers/devices in the systems. It would have been nice if Dell told us the specific devices with issues instead of specific computer systems.
But then perhaps they felt that would be overload.