No matter if it's my newest iPhone, iPad or MacBook Pro, I always choose to wipe it completely, perform a clean install and start fresh.
I backup my devices daily, and also maintain complete images. Although obviously it's laborious to start fresh, I'll purposely wait until I have time to do so since I have lots of patience and always have ideas regarding modifying my setups.
That's one of the reasons I love my Nexus 6 Android, that's an OS that offers endless possibilities. Each time I try something new it results in better productivity.
I'm five hours into a very busy day on my iPhone 6+ and thus far I'm positively thrilled and very impressed with both battery life and a bug free version of iOS 8.1.2. (12B440).