The biggest deficiency of iCloud Keychain that on iOS devices one only has access to (including manual lookup of) passwords that are used inside Safari. There is no way to access passwords for things WiFi networks.
But password-protected notes are not meant to solve that problem. They are there to store text that is not something to be filled into any login forms. That can be your Passport ID number to any sensitive piece of text.
What is the difference between password-protected notes and secure notes? Both are pieces of text that are encrypted and that a viewed by going into the application that stores them (Notes or 1Password). Both have nothing to do with web passwords as those are filled in automatically and not looked up manually.
1Password is nice but there are so many things that require manual entry (eg, WiFi passwords, server share passwords, iOS device backups) but can be stored by simply checking a box in the OS keychain.
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Yes, but there is no way to access that from iOS.
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Password protected notes can be used to replace one element of what 1Password offers: Secure Notes. iCloud Keychain can be used to replace another element of 1Password: Passwords filled in by Safari.
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Have you compared the current battery capacity in mAh against the design capacity? About This Mac > System Report > Power gives you current battery capacity in mAh, battery health status and cycle count. Instead of then looking up the design capacity and compare current vs design capacity, you can also download the app
coconutBattery, which gives you the current relative (to design) battery capacity.
You can also use the app to periodically save the current battery status (manually or automatically) and send your anonymised battery status to their website where you can view how battery capacity of other copies of your computer model (and other models) has developed over time and as a function of the number of charge cycles. Note that these statistics appear to have some bad data in it. For example, the MacBookPro9.2 (mid-2012 13" MBP) should not have any data beyond 44 months (with some prototype copies or batteries manufactured a few months before the first official units shipped this might extend legitimately to 48 months). You can
see that data move off-trend from 46 months and get quite sketchy from 60 months onward. But the trend up to 45 months is pretty smooth and thus looks credible. It might be worth comparing your model against this trend (will give you some more ammunition at the Genius bar as well).
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Have you ever gone through an OS upgrade (major versions) on OS X? The look might change somewhat but for most purposes you will have trouble even telling that you are running a new OS version. Noticeable changes will be focussed on only a limited number of areas (for El Capitan Disk Utility for example).
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If you insist on following
beta builds, then yes, you will get new updates every 3 minutes.