Hi guys! I'm using my iPhone 6 on iOS 8.1 since I bought it last year. I jailbroke it after 2 days of ownership. I don't have a lot of stuff on it, some apps but mainly music (downloaded from the Deezer app). I started to see some sluggishness here and there, so I was thinking about reverting to stock iOS 8.1 using cydia Impactor and starting fresh. Another option would be to update to iOS 9.0.2 (I won't update to a version I cannot jailbreak). What are the new features I'd get by updating and what are the disadvantages? A friend of mine updated his 6 to iOS 9 and was not happy with the performance... This worries me a bit. Thanks!