When you bet the farm, failure isn't generally an acceptable option.
As for the topic-- there was no reservation for me to cancel. I've been skeptical since they announced this whole "free" upgrade fiasco. I never intended to give up my retail Win7 license, since I felt sure the upgrade would end up invalidating it and giving me what amounts to an OEM license instead.
I never installed the optional "nag" update, so I've been lucky in that I haven't had to deal with the nonsense others have posted.
I will (most likely) eventually... begrudgingly... upgrade when DX12 becomes more of a thing, but not a moment before. And even then I'll be buying a retail license instead of taking the upgrade. I'm really hoping that Microsoft sees fit to backpedal on some of its more unreasonable changes in the coming months before I do, though-- forced driver updates is a deal breaker as far as I'm concerned, and I will not budge on that stance. I'm not particularly thrilled with forced "feature" updates, either, since I tend to pass on most of what they've offered in the past.
When I do move on to Win10, it will literally only be for DX12. Everything else (for the most part) will be ignored, and I certainly won't be using my MS account to log onto my PC.
I've been recommending it to friends and coworkers who have asked about it, though. It's honestly a nice upgrade in most cases... but in its current state it isn't something I'm willing to install on my own PC.