Is 4 hours of SOT good or bad?

I'd say it 'Meh'. But also, keep in mind that SOT isn't always an accurate representation of actual battery life. For example I probably listen to about 2-3 hours of podcasts or streaming radio that isn't reflected in the screen on usage. On average I get about 3.5 to 4 hours of SOT because of it.
 
I think it depends. Especially if your "moderate usage" habits change, depending on the day (ie, your "moderate usage" at work could be browsing and texting more often; but "moderate usage" at home involves more video watching and downloading music).
 
I've never been one that gets a lot of screen on time as I do a lot of streaming of music, podcasts and radio in the background so to me four hours is fine.
 

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