I for one am relieved that they removed the macron from the 'o'. Why in the world would you go out of your way to put a diacritic there if you don't even follow its pronunciation rule?
I like the current logo. After reading this, it makes me wonder how much time was spent worrying whether the reflected 'b' should be forwards or backwards.
Xobni's marketing strategy is as memorable as Serutan's: in both cases you have to immediately explain what the word is ("It's Nature's Spelled Backward!"). Normally the goal of positioning is to own a word or phrase in the prospect's mind, this approach may be as ill-fated as Volkswagen's "Farfegnugen" campaign.
I understand the reason behind it, and its great to have a fabricated word as it's very trademarkable... but it never sat with me well.