It seems to work well. I see the ads myself occasionally on FB and they look great and are decently accurate as to what products I have been looking at.
Very easy to set up.
BUT, the ease of use makes the app TOO simplistic. There are barely any reports to look at for ad performance. The only thing you can see is total spent, revenue, and profit.
You cannot see CTR, you cannot see any other FB ad metric. You also cannot set the amount of time you would like these ads to show for someone (the amount of time they are in your custom audience) without contacting support.
The biggest issue that I have run into is that the revenue statistic is COMPLETELY OFF. Currently, my spend is $40 and my revenue is $26k. This is wrong.
This total revenue might be from other sales of ours through other sources (like google, and Point of Sale in store), because it is certainly NOT from the retargeting ads. I know that for sure.
Customer service is ok. Takes them a while to get back to you sometimes. I talked to them about this and they said that sometimes the numbers glitch out or something to that effect.
I like the look of the ads and the ease of use, but the numbers can be flat out WRONG, and there is minimal reporting and ad customization available.
I hope to see improvements in the future.