Perils of relying on embedded HTML in RSS

Question

Can anyone advise me as to any potential issues with embedding our RSS feed content as HTML using:

 <content:encoded><![CDATA[ *insert HTML table layout w/ inline styles* ]]></content:encoded>

I'm rather opposed to this practice, as I feel it fundamentally breaks the point of using an RSS feed over a webpage, but have not found any serious problems with display in any of the big RSS readers.

I did notice that Firefox's default reader ignores the <content:encoded> tag entirely, but everything else seems to parse it fine.

I know this is not the trend in RSS feeds, but is anyone embedding this much formatting in their feeds? Is it problematic?

Thanks.