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Personally I think it’s worth the extra. It’s much easier to fit and service than Di2, it’s lighter and the shifting paradigm is much more intuitive, right lever to shift up a gear, left lever to shift down and both together to shift the front derailleur. I like that it gives you feedback too, so when you shift you know it’s worked.
Di2 is quite different in that respect.
Pretty much all this, and they're great to work on, the customer service in regards to warranty is very good (which SRAM have learnt a lots on).
As Andy said; lever shapes is the biggest impact; go for the one that felt the most comfortable, personally found the eTap levers to feel very neutral, like it felt like it can fit a wide varieties of hand shape.
Personally I think it’s worth the extra. It’s much easier to fit and service than Di2, it’s lighter and the shifting paradigm is much more intuitive, right lever to shift up a gear, left lever to shift down and both together to shift the front derailleur. I like that it gives you feedback too, so when you shift you know it’s worked.
Di2 is quite different in that respect.
I also prefer the lever shape, but that’s very subjective.