yes but the overall consensus is that you get a cleaner install and better battery life.
Taken from
http://www.imore.com/how-fix-iphone-6-and-ios-8-battery-life-problems-0
3. Restore your device as new (not from backup)
The single biggest cause of battery life problems with iOS devices occurs when they are restored from backup and not set up as new devices. Whether it's cruft or corruption, bit rot or simply bad bits, a clean install as a new device — incredible pain in the butt though it may be — is usually the best fix for any battery life issues. This is the nuclear option. You will have to set up absolutely everything again, and you will lose all your saved data like game levels, but in most cases your battery life will be better than ever.