There was some back and forth at Glenn Reynolds site about delaying iOS 7 upgrades. The day before the iOS 7 rollout I emailed all my family and told them not to install it until some time had passed and Apple had a chance to do revisions. This is my general policy with all major OS upgrades (and many program upgrades) but all the more so with Apple software because they never allow download of older versions of things like iOS or iTunes and thus make it impossible to roll back problematic releases. Now that we see issues about battery life and slow performance with iOS 7 on certain iPhone versions, I am glad we are waiting. Feature-wise this is a very incremental release (masked to some extent by a totally new visual look) so I can certainly wait.
(The other software that is very much in this category is Quickbooks. Their history of buggy software is terrible, and because upgrades tend to modify the database in ways that cannot be rolled back, it is another example of software where one needs to be very, very careful before upgrading. Let others be the bleeding edge).