Let’s break it down:
Who Is iOS 9.3.2 For?
As with all iOS 9.x releases, iOS 9.3.2 works on the iPhone 4S or later, iPad 2 or later, iPad mini or later, iPad Pro and 5th generation iPod touch or later. Users will be prompted to upgrade, but if you have yet to receive a notification it can be triggered manually by going to Settings > General > Software Update
Interestingly the size of iOS 9.3.2 differs wildly depending on your device. For example the update is just 50-80MB on the iPad 2 and iPhone 6S, but it balloons to 1.4GB on the iPhone SE and 1.6GB on the iPhone 6.
The Deal Breakers
The big concern with iOS 9.3.2 is it’s bricking some devices, in particular theiPad Pro 9.7. Affected users find that when their device restarts they are given an ‘Error 56’ notification (confusingly, a hardware error) and told to connect their devices to iTunes. This doesn’t help in most cases though and any attempt to reboot a device just sees error return.