I've been running the insider preview for Win 10 Pro for couple months now on my new tower. It's fast, stable and a very nice improvement over Windows 8.1, and they brought the Start Menu back! So that jarring experience of between the desktop and start "screen" that many dislike is now an option that can be turned on or off via "Tablet mode."
I'm not privy on the home edition details, but for a free upgrade I would recommend it when MS finally releases it.
For those who would rather not upgrade however, Windows 7 will be supported with OS updates through 2020 and 8.1 for several more years thereafter.
EDIT: The bugs are there in the preview build, but i've found that MS has been responsive and quick to fix them...the latest build is very well polished.