The "voice" is clear enough to understand, and better than most I've heard-- better than the MS Reader voice, for example. The Odiogo voice also skips reading out the punctuation marks, something I've always found distracting in other text-to-speech systems.
I have noticed that listening to the posts out loud is very different than reading them. It's the difference between writing an essay and writing a speech-- it's possible that this distinction will go away as this kind of technology improves and becomes more widespread.
The company promotes this technology as a way to catch up on blog reading via podcasting while commuting, exercising, etc. Based on my experience, I think they're onto something-- though I'm thankful my commute (long as it is) is not long enough to listen to all my feeds being read!
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