I've been running the fast ring for many months. BY FAR, my biggest gripe and general concern is battery life. I'm running it on my Lumia Icon...with skype logged out, and only a handful of basic apps running in the background. If I'm using it lightly (a quick 5 minute phone call, and a dozen texts), I MAY make it 4-6 hours without needing to charge. I tested this theory on my son's Icon (he's young and rarely uses it). I've done a full hard reset on that phone, and just allowed it to install everything basic (with no restore or apps installed after hard reset). Even with NO use, just sitting idle, the phone might make it 24 hours if I don't touch it......that's just sad. Am I the only one that feels they constantly need to be "near" a charger at all times just in case you end up 2 hours from a charger and need to take a few calls? On 8.1 with the same apps on my phone, I was comfortable with 10-12 hours of hard use, and once it got to around 25%, I still knew I had a few hours left. When this this hits 25%, you've got less than an hour.