It's definitely a big upgrade from Series 3. I think my other watch is either a 4 or 5 (not sure) and I almost stopped wearing it cause it was getting laggy'ish and bored in general. The rugged new looks and the massive display is actually quite nice, and brightness is super good. The battery life based on the reviews is about 2.5 days with heavy use and with my use I am thinking it will last me at least 3-4 days as all I do on it is look at time and then only if any notifications show up, but I plan to start using it during my work outs now so that will impact it surely.This quote is hidden because you are ignoring this member. Show Quote