It's been just shy of four months since Microsoft released the latest edition of Windows, version 10. Back in July, I advised that the best course of action was to hold off on upgrading to Windows 10 (unless you were really dissatisfied with your current OS). My advice was to wait until the bugs get worked out, and see if any issues arose as the operating system was installed on the huge variety of Windows PCs that live out in the world. Well, we've gone through a quarter of the year, and I would say that this new version of Windows, which has been installed on over 100 million computers, is ready for primetime.
I never had too much concern, but in general I advise most users to hold off on major upgrades until all the kinks are worked out. This month, Microsoft released a significant update to Windows 10. Long-time Windows users might recognize the term "Service Pack." These were major updates to previous versions of Windows that fixed problems and added features. The Service Pack term isn't being used here, but everyone pretty much agrees that it's analogous. This major update should address most of the glitches that may have been experienced, fix security holes that might have been found, or improve user interface elements that users have complained about.
For this reason, I'm now changing my position on Windows 10 upgrades, and advising that it's safe to jump into the water. This doesn't mean that an update is certain to go smoothly with zero ill effects. I can't emphasize enough that before you upgrade to 10, you should make sure all your files are backed up (though I hope everyone is backing up already!). If you're at all nervous about updating to Windows 10, I'm happy to offer my services. I'll back up your data first, then go through the update process.
In the end, though, you'll have to decide if you even want to update. Personally, I'm still a huge fan of Windows 7. I think that at every point of Windows 7's life cycle, it's been the best operating system that Microsoft has ever made. I've been running it on my main computer since August of 2009 (since it was in beta), and for me, it's always been great. In that time, I've never even reinstalled the OS. If you don't have any problems at all with your current version of Windows, then you might not want/need to update. The main consideration you'll need to make is that Microsoft has given you a deadline. You will be able to upgrade to Windows 10 for free for one year from release. That means that after this July, you'll have to pay for Windows 10. However, if you really are fine with your current version of Windows, this won't be a problem. Windows 7 will be supported by Microsoft until January of 2020. Most likely, you'll end up getting a new computer before then, and that computer will come with Windows 10 anyway.
(If you're using a computer with Windows XP, I strongly urge you to purchase a new computer - Windows 10 isn't available as an upgrade to XP, but XP is no longer supported and shouldn't be used for security reasons. Purchasing a new computer is the least expensive way to upgrade.)