Not installed yet but I wouldn't be too paranoid. These are heavily tested before release. The brick update (which if memory serves only affected a small percentage of people running a certain model of a recently released iPad) was very much a one off.
Remember that there are more than half a billion iOS 10 devices out there. That's double the number of computers running Windows 10, if my shoddy memory or paint-by-numbers mathematics is anywhere on point. This was the company that pushed an update to silently change an entire filesystem on all of these devices; simply a monumental achievement. It would be so so easy to rush a patch and screw up a load of phones.
Apple are terrified and paranoid of the media fallout from failure, especially with iOS updates. They're more scared about it than you are, so they wouldn't have released it if they weren't sure!