basically that. I'm forced to update my phone, so i'll be getting the 8. Its going to be running ios 11. I have a SS gen 0 watch and i don't want to update that to os4 as i'm worried about battery drain and performance issues. So my question is this: 1. Those who do have gen 0 watch, how is performance with os4? 2. Am i able to keep os3 on the watch when i pair it with my new phone?