Hello. I just got my first Apple Watch serie 1 with sport band for 329 on Applestore. Great product. Only use it to iMessage, mail and call. The watch works smooth for me. Got a great deal on a brand new serie 0 ss with leather band for 299, should i take this to get the safir glas? How mutch stronger is it with scratches? Have try the s0 now with os3 and it works fine, same speed when i open light apps, and it seems smooth in the menu also. But serie 1 scroll just a littlebit smoother where the app menu is. I Wonder if the serie 0 would be laggy on the next os4? Not easy to say. I need to choose one of them in this price range. Happy for some answers.