A couple of years ago (when Win10 was still available for free) I installed it on a PC here. Unfortunately at that time it was ludicrously unreliable and I ended up removing it - but a couple of months ago I bought an Apple Mac and decided I'd try dual-booting it with Windows 10. So far, Win10 does seem more stable these days but it's also horribly expensive now (if bought from Microsoft). But there seem to be loads of companies selling it a lot cheaper now and AFAICT these are legitimate copies and fully supported by Microsoft. Apparently, companies can now buy in bulk from MS and sell Windows 10 to the public at a discount price.

Does anyone have any experience with buying one of those cheaper copies (good or bad?)