I tried it, not too bad, but ...
I gave the preview a try side by side with the old style. I tried the "Dense" style. Not too bad looking, but it is still missing the key feature I am looking for: allow me to control the size of the columns. Even in the Dense view, there is TOO MUCH WHITE SPACE. It uses 15 to 20% more screen space at same zoom level, while showing less data (subject line). BAD GOOGLE!, BAD! (the "non"-dense theme is even WORSE!) Quit wasting my screen space. I paid for it, I want to use it. If I have a large, high resolution screen, I want to pack information on it!
I prefer the use of color in the old theme. The color scheme of the new theme reminds me too much of the new Office 2010 ribbon "gooey" Grey color scheme. Too flat, to little contrast between elements. And the wider spacing is similar to the the "new & improved" default spacing introduced in Word 2010.
Frankly, I wish they would give us the option of continuing to use select the old theme.
Bottom line, I agree, "If it ain't borked, DON'T 'fix' it!" The current theme is NOT broke! The new ones ARE! (by my standards).
