Should I install iOS 9 on my iPhone 5s? Is it worth it?

I have heard good things and bad things about iOS 9. Is it worth it or not? Because I'm worried about breaking my phone. Plus, iPhone 5s is quite old.

I always wait at least a few months, let the bugs get worked out first. The bottom line is if you are happy with what you have now then I don't think you should upgrade unless there's a major feature you want.

One important thing I see is that the OS is going from 4GB in size to 1GB, thats pretty impressive, and if you are short on space then you may gain an additional 3GB.

If you want the fastest speed I would look for a 5ghz or better port, and a ethernet cable that can use 5ghz. Then you will have a above average speed.

Yeah try it out

The 5s is only 2 years old. Not that old at all. Of course an Apple issued major update wouldn't break an Apple made smartphone.