I was an early tester for Windows 10 and I saw how each successive build of Windows 10 improved on previous builds. I'm pleased to report that Windows 10 runs very nicely on both tablets and laptops/desktops. I've found that there are still a few bugs in terms of some of the settings, but I'm sure these will all get patched in the near future. In my experience, none of those bugs seem to affect the functionality of running applications and maintaining productivity.
I'll continue to see how Win 10 performs on both slower/older machines and on newer/faster devices. You'll see that Win 10 comes with a "Tablet Mode" which you can enable/disable on touch-screen devices, but I'm found that I prefer to do everything in standard desktop mode so far.
Swiping in from the right or left sides of the screen provide much more intuitive functions and features on Win 10. Also, having every app listed under a single Start Menu reduces confusion about desktop vs. mobile apps running on Win 10.
Here's where Win 10 still needs work: the settings. You can get to "All Settings" by swiping in from the Right, but then you'll find that occasionally you're thrown back to the old style Control Panel. We all love to tinker with those Control Panel settings, so remember that they're still there. It may be a bit tricky to find, but keep clicking around and searching. You'll eventually find it.