I would recommend Perfect Audience to anyone who wants to use a 3rd party to scale up. I find the audience builder pretty terrible in Google AdWords so I was looking for something a bit easier to use and this fit the bill easily.
Smaato is very well suited for user acquisition and retargeting companies. Their overlap in terms of audiences and publishers with other exchanges is very limited, which makes it a great alternative when you need to scale a campaign and want to maintain your frequency cap. They work very well in branding campaigns as well as performance campaigns.
The bulk uploading feature is certainly my preferred feature of Perfect Audience. This tool has made creating new ad campaigns quick and easy. I used to have to upload facebook then Instagram then another social media page and instead I upload everything all at once and it certainly makes it easier for all of us.
Smaato has a UI where you can control your line items on the traffic you want to receive. That is a key unique selling point that other SSPs don't offer. Most of the items that you will need like reporting can be done on a self serve manner and that is a big plus, specifically for changes that need to happen really fast and you don't need to deal with account managers that may take some time to answer emails.
The support team could be a little more useful. After our implementation calls and getting everything setup, we did feel that they were not as responsive and I did find myself googling solutions to things that the support team could have helped us with.
Smaato's account management team is very professional. They are quite fast in terms of customer support, which is very helpful. One item that stands out is that they are willing to understand what you need for each campaign and what is the best way to move forward. They don't just jump quickly into trying to upsell more of Smaato's products (audiences, data) like other SSPs do.
The convenience of Perfect Audience has made things smoother for us. This convenience means less time spent managing ads and more time focusing on running our business.
Re-marketing features have been superior to AdWords.