Why You Might Want to Install It Right Now
There are also some reasons why you might want to install the iPhone 5's iOS 8.4.1 update right now. Three to be exact.
One, it might solve your unfixable iOS problem(s). iOS 8.4.1 doesn't come with a huge change log but iOS updates have a tendency to smooth over problems that aren't listed in the change log. There's no guarantee but if you can't find a fix for your issue, installing iOS 8.4.1 might be worth a shot.
Two, if you use Apple Music. iOS 8.4.1 is focused on enhancing Apple's new Music platform and it comes with fixes for some annoying issues.
And three, if you're concerned with security. iOS 8.4.1 delivers a number of security patches that close up exploits. So if you store sensitive information on your device, you might want to consider the iPhone 5's latest update.