Year ago I have installed W8-0 and although I bought two Pro keys and two WMC keys, I stayed with Enterprise, because: -it has largest feature set (Windows2Go, etc.) -it installs in one step (not like: 1. clean install some OS, 2. W8-0 Pro Upgrade key install and 3. WMC install) -I didn't needed that terrible WMC app, as I never wanted TV Tuner card... And that WMC UI? It can't be more confusing... Today I tried to upgrade to W8-1 (and decrypted TrueCrypt system volume for that). Here are the findings: 1. There is no Windows Store update for W8-0 Enterprise. Why??? 2. All those W8-1 Windows Upgrade Assistants are s**tty apps. They gave me various errors (no upgrade in your region, Windows can't be downloaded - use Windows Store (on Enterprise)...) 3. So I used Pro RTM ISO and W8-0 Pro key (retail, valid) of course didn't worked (as setup said: "for this edition"), so I put Pro non-VLK key there with intension to apply my key later via -ipk. 4. But real surprise was this: Choose, what you want to keep: <Settings> or <Nothing>. What about those 200 installed apps? (I also tried W8-1 Enterprise setup with same result - no apps to keep...) After this I quit of course and I will stay with W8-0... So the conclusion: "THANKS" MS for forcing us to update OS each year, it is real pleasure to do that on 50 company computers, especially when it includes Server too (and new SDK, ADK...). Also thanks for creating havoc in drivers (there are W7, W8, W8-1 drivers already and I also hope for W8-2, W8-2-5, W8-3 drivers etc.) Also please, MS, continue to provide new proprietary versions of WDDM v1-x, NDIS v6-x, DX v11-x with each new OS version each year. It is real fun for users when installing drvs... And to those W8-1 enhancements? I only found three minor ones: 1. Tile for Immersive Control Panel, 2. Boot to desktop and 3. Option "Apps from same developer" in Windows Store.... That's it. It is really the reason for new OS. Really. Also it is GREAT that W8-0 will have only two years support and while W7 users will have IE11, W8-0 users will have IE10. Really nice policy... Finally it is nice, how many people are catched with that "GA Rollup A" nonsense, althought there were three bigger updates on W8-0 (KB2756872, KB2770917, KB2779768) and nobody called them Roll-up or Roll-down or semi-SP or whatever. It is just update... What is your opinion? What do you think?