The current instance that I am working in does not have RCE, I would trade it in a second for the Email Insights. This system is severely lacking in the depth. And what would be a great analytics only scratches the surface. The by platform "device or by OS is utterly useless. I get Mobile, Desktop, tablet or other. Surprisingly, most of my opens are for "Other" what does that even mean? Apple iWatch?
Then for OS, I see the above. In my experience, most opens have migrated to mobile, and iOs is the highest metrics for OS.
It is very hard to navigate. RCE gave me, albeit slow to process, a much deeper dive into my campaigns.
I find myself getting frustrated every time I go into this tool.
I read the docs but it just seems so superficial overall.
There was a great article in EConsultancy this morning about email optimisation that talks about best practice for measurement:
Eh, I don't think it was so great. 
For one thing, the person opining about people not understanding statistical significance himself doesn't understand significance.
And he also says this:
Therefore, the dominant strategy is to use opens as a proxy metric for email marketing success.
Which is spoken like someone who's never heard of a little product called Microsoft Outlook.
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