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I took a look at the Loopnet.com community profile pages, and more specifically, at their blog pages. It looks as if it just pulls in the title and a a short excerpt from the feed and links out to the original site page where the content originated. So to answer your questions, no you should have no problems with duplicate content. Also, it may be helpful for your client's site because the links appear to not be nofollow and should pass link juice.

Hi John, Currently I don't know of a way to dependently get Google Reviews on your site. We just created a video of highlights for our review page. It shows reviews from around the web... if you want to check it out you can