Previews and Renders

So, all the documentation tells me never to use previews when exporting because it will degrade quality.
My previews are always set either to Uncompressed 10 bit or ProRez HQ, so is Premiere somehow down-rezing my footage on export to lower than either of those codecs???
Seems strange to me to claim "never use previews when exporting" when it all depends on how you have your preview settings set.

I guess the documentation is a little misleading, or confusing.
Yep. The documentation mostly addresses the general case, where the preview codec is set to MPEG2 for rendering fast preview. With a production codec set for rendering preview it is safe using preview files for final render. My testing in After Effects, when AE project is set to 32 bit, working space is linearised, all rendered preview, final renders with and without using rendered preview files are dropped into the same comp and the blending mode of all layers is set to 'Difference', results in pure black solid no matter which pair of files I compare.
However, rendering preview with a production codec takes much (or, depending on a spec, maybe not so much) longer - that is the trade off, 'cos you may need to render preview several times while editing, whereas final rendering is typically done just once.
Does use Max bit depth, and Max render quality actually do anything in CS6?
In my understanding enabling 'Maximum Bit Depth' in Sequence Settings is more or less like setting working space into 32 bit. Ticking 'Maximum Bit Depth' in the Export Settings dialog enables to render at higher bit depth, if chosen codec allows to do that. For mor details see this The Video Road blogpost - Steve Hoeg gives quite detailed explanation on the 'Maximum Bit Depth' at the end of the article.
See also this discussion about 'Maximum Render Quality'.

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