I've been using retargeting for the last year and have found great results but there are a couple of tricks that you'll need to follow.

Download it here - http://reipartnerpodcast.libsyn.com

Step 1 - I prefer Adroll.com over Adwords and Facebook pixels because its easier.  You have 1 platform to manage instead of 2.

Step 2 - Keep it simple.  Adroll helps you with this by managing both networks in a single UI. 

Step 3 - Free graphics.  That's right, Adroll will create all of your graphics for free.  Plus, they'll create new graphics every 90 days.

Step 4 - Use the Adroll team to optimize your campaigns on a 90 day basis.  You'll receive an email from them asking if you'd like them to assist.  Just reply to the email and they'll pimp it out.

Step 5 - Make sure you setup conversion tracking. 

Note: On a monthly basis you should get 30,000 - 50,000 impressions and convert 4-12 leads

Retargeting software that I use - www.adroll.com

Contact me through my Facebook page - REI Partner Podcast

Or

Take a look a couple of lead gen sites that I manage.  The Dallas "we buy houses" site has retargeting setup and the Austin site has been leveraging it for some time.

By the way I just launched a new lead gen site in the Atlanta area.  Take a look and let me know what you think Jerred Buys Atlanta Houses