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Are there certain things I should look out for? Did it help your PR?
All good questions! I look where a site ranks and who it links to and ask a number of basic questions before buying links. Hopefully the owner can tell me some geo and demographic informaion so I can decide if it matches mine and how I could use that.
I also like to work with sites that will allow me to place my link within the content areas and not in the footers. I like to avoid site wide type links.
A couple anciliary things to consider - ask if they renew at discounted rates and if they have a newsletter. If yes to the newsletter, subscribe to it and if it's a good one, ask about buying a link there as well.
I've never used a link broker so I can't speak to them directly, I usually go over to Teoma and search on my terms/complimentary terms and broker my own links. Teoma uses Subject-Specific PopularitySM to group their results and ..."ranks a site based on the number of same-subject pages that reference it" - which makes my job of finding potential link partners that much easier!
Hope something here will help you.