Here is the list -
1) The performance is snappier - boot, wakeup, application launch, task switching, almost everything is faster than Windows 7. My 5 year old laptop cold boots in 12 seconds, and wake-up is instantaneous
2) Start menu
- It is a better replacement to original start menu, takes some time to get used to but not much.
- Applications can be accessed quicker, all the common tools are just right click-lower left corner or just start typing when on start screen. Very convenient
- WinRT applications are very snappy, even switching tasks with video (left click- upper left corner)have zero lag.
- Side by side is useful, for consumption. Any more parallel tasks run just fine in the full desktop mode
- Live tiles are better than static shortcuts, why? you don't need to open those to see any updates. Just a quick glance is enough to be catch-up things of interest. One click on Win key and you are then back to your work
- Charms menu left click-upper right corner is also useful, all application specific context, settings and search is available. No need to navigate to folders and menus for that
3) Desktop Mode - This works exactly like Windows 7, and is required for any serious work. All said and done, touch has its limitation and real work gets done by keyboard and mouse. But having both options is better than having just one.
4) Built in antivirus - no nagware, updates or system slowing antivirus to worry about. It totally runs in background
5) Task Manager is much improved, keep it simply or get more details
6) Full backward compatibility, everything I had on Windows 7 works in Windows 8. All drivers, CAD, RC simulator, ESC programmer, everything
In my view it is the best Windows version, and a must upgrade