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I got these bars as I was upgrading to R8070 di2 with the end plug junction box. However, the holes aren't located in the best positions. The shifter cable holes are located on the flat section of the drops, near the ends. As I understand it, they can't be on the curve due to potentially weakening the alloy. But means having to run the cable up the bars to the shifters.
The hole on the top (to ultimately connect to Junction box B) is in the centre, meaning without a compatible stem, you can't get the cable out, because the bars sit flush. So, without a di2 stem you can't get the connector out to feed in to the frame.
Without drilling your holes in your alloy bars though, this does still work for di2 setup using the bar end plug and leaves it neat & tidy. You just have to still run a cable from a shifter to Junction box B.
Probably not worth it for the old style Junction box A.
Also, the positioning and feel of the bars is very nice. Doesn't feel any different to my old Deda compact bars.