I’ve installed it on two computers and I’m holding off on my other two. The first two have been major clusters. The computers have slowed down considerably. Almost nothing was migrated over. On one I can’t get programs and website to pin to the start page and on the other I can’t get anything off the start page. It has a nice look, but I don’t think it was ready for primetime. If I can figure out how to go back to Win 8 I will and wait awhile until they get the problems sorted out.
I installed it yesterday and did some tweaks to suit my tastes. My take: It pretty much mimics Win7. I don’t notice anything horrible about Win10, but I also don’t see why anyone would upgrade either. I’m not going to use the Cortana thing or any other of the new named services. When you do update, choose the custom option and choose to not let Microsoft collect all that information about you. I doubt it will make your life better because the mobile app will probably always stink if you use Android. So if you feel the slightest urge to wait, then wait.