I got my Powerbeats3 over the weekend and so far I love them. The battery life is crazy. I use them to sleep with (binaural beats) 5 hours, then I use them to listen to podcasts while I get ready for the gym 2 hours, then music at the gym, 1 1/2 hours. After all that I am still only at 50% battery
I throw them in the Mophie charge case I picked up and they charge while I shower and get ready for work and I am good to go for the rest of the day.
They pair quick and I have tested them switching between all of my iCloud Apple devices and its flawless. iPhone, Apple Watch, iPad Pro (both of them) and two rMBPs. I click the BT icon and pick Powerbeats3 and poof, audio is coming from that device.
I have the Powerbeats2s as well and I feel like the Powerbeats3s seal the ear canal better and because of that sound a bit better. And I know its small, but I love that the PB3s don't have a battery cover. I ripped the ones off of my PB2s because it was annoying to open the flap to charge them.
I am going to keep putting them through the paces and see how I like them a month from now. But for now I have removed all of the other BT headphones I had paired with my phone and using these exclusively.