I upgraded as well just for curiosity, everything looks fine (from win 7).
I've never seen an update process going so well before. I lost absolutely nothing (obviously no data, but also every single program or driver I need still working as well).
I think anyone on win 8 should do it without much questions since it was so bad. Coming from win 7 it's mostly questionable for privacy and auto updates.
But tbh if you have any of those concerns you should be on Linux anyway (or any other open source OS). If it wasn't for all of those programs and games tied to Windows I'd be gone from it a long time ago, no version will probably change that fact. With that in mind, free upgrade that doesn't seem to break stuff for me? Sure why not.
