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Effficiency is nice but it is secondary to productivity in importance. Efficiency without productivity is analogous to arranging deck chair on the Titanic. If I am stressed or disturbed by a GUI then it detracts from my productivity. Having said that, I find G3 a lot more utile and comfortable than Unity. But I find both KDE and XFCE significantly more utile and comfortable than G3. I have either KDE or XFCE, and G3 on all my desk/lapboxes and use the one that I think fits better with the task spectrum presenting.