Like 99.9999999999% of the Windows users, I will "upgrade" to Windows 10 when it comes preloaded on a new PC that I buy sometime in the future (maybe in a few months, or few years, from now; who the heck knows). And I do it because Windows 10 is the only preloaded option offered at that point with new PCs and only with guaranteed support for years to come, not so much because I really feel I need it.
As it happens, today we are going to buy a new Android phone, and now I am trying to figure out whether to buy one LG model with has Android 4.4.x, or one which has 5.0 Lollipop (both cost about 199€). Newer Android is better, right? But then I read some reviews that 5.0 causes some problems and has stupid flaws at this point on that phone (e.g. no visible clock on the main screen, no sign light for missed called or incoming messages, etc.), so maybe go with the 4.4.x model for now... The 4.4.x model has a bigger screen (5" vs. 4.7"), and maybe it is possible to upgrade it to Lollipop 5.0 later (when it is mature) with CyanogenMod or such.
getlogan: I don't like the mandatory sign in with microsoft account. A few builds ago you could still skip it (in a not-so-obvious way). If you did skip it, later in Windows you would get a feedback form stating they noticed you did not sign in with a microsoft account and wanted to know the reason.
Well as of the recent builds, that option to skip sign in is gone...(so I wonder what they thought of the feedback lol).
Awww... but I guess it is still possible log in offline with the MS account.