Currently I have 35 sponsors with RSS feeds listed on my resource site: only 7 validate fully and 10 don't validate at all.
I have been able to use Nubiles despite the feed validating with a warning, but one thing I have noticed is that when you include several feeds which don't validate fully, there seems to be a cumulative impact.
Which is why I suggest people should start by validating their own sites and feeds, then start by adding the sponsor feeds which do validate and only after that begin trying the rest: one at a time, testing your site (and feed validation, if it concerns you) after each addition.
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