A few good points in favour
Well, Windows 10 has been planned to be "the platform" - not just OS. It will not only available for 32 and 64 bit PCs. It will also be made available for smaller devices like tablets and smartphones. Microsoft has come up with the concept called Universal Apps. These apps will run across all devices running Windows 10. Thus upgrading to Windows 10 should give you seamless sync. Just like what we have experiencing with Google.
You will not need to worry with the interface as had been the case with Windows 8. The update has a redesigned interface. The design language appears quite refined.
File explorer has received considerable improvements. You can now Pin your frequently accessed folders on the Home screen of the explorer.
Lesser usage of the right click option has been one of the subtle changes that have been brought to Windows.
As for the apps, Microsoft has been into making it easy for the developers to convert their Android apps to the Universal apps. Thus the developers need not go into extra efforts to create apps for Windows 10. Hopefully, this move will make more developers port their apps to Windows. Apart from that the Windows Store for Windows 10 is getting completely revamped.
The quality of the built in apps has considerably improved. Photos, Mail and Sports and News are some of the apps that have been quite interesting in this regard.
One of the points we have been looking forward to in Windows 10 is the new Edge browser. It is expected to change the way we used to look at browsers from Microsoft.
Microsoft is coming up with the new Continnum feature that lets you connect any device to work as a PC.
Security has been beefed up. Device Guard is the new feature that will help you neutralize any attacks on your system remotely. The system is designed to avert any attacks on your system.
Windows 10 incorporates the new Windows Hello. It is a biometric support that does away the need for a password. It uses your face, iris or fingerprints to open the files or applications.
Cortana should be one of the strong reasons to update. The personal assistant from Microsoft has really been great and well integrated across all services provided by Microsoft.
A few points against Windows 10
Stability could be one of the major issues. Microsoft has already released a massive One GB of bug fix downloads. That should give you a clear idea of the issue. These patches are likely to bring them more bugs. It could be a good idea to stay away till it stabilises.
Another point that has been going against the plan to update to Windows 10 is the aggressive manner in which Microsoft has been pushing the update. The updates are being installed on customer systems without any warning. This could be a reason to annoyance.
Windows 7 has been treated as the most intuitive OS so far. You may not be able to see that kind of ease of use on Windows 10 - at least in these beginning stages.
Some of the useful features from Windows 7 have been removed. One prime example could be the Media Center. There are reports that some games have also been removed.
The compulsory updates may cost you the precious broadband data. Do remember that in addition to getting updated on its own, your PC will send the updates to all the PCs in your network.
Privacy is reported to be one of the major concerns with Windows 10. Microsoft has been collecting quite a huge amount of data Though there are a few ways to block access to this data harvesting, you cannot be sure of being able to prevent the transfer of your data to the tune of cent percent.
It would be advisable to check out with the service providers of the regular applications you have been working with. They may still be working with the new version compatible with your Windows 10. It may be wiser to wait till your software is ready with an updated
version than being sorry to see your applications not working.
Having pointed out all that, I should hasten to add that Windows 10 is indeed is quite good with a cleaner interface and useful features. The fact that the upgrade is free for existing users can be a reason enough for you consider the upgrade. Moreover, if you are not happy with the upgrade - you can easily roll back to your older version. Do not forget that you have only 30 days time to decide on roll back.
Live....and Let Live!