I have used Adstream for my publishing/editing company and I loved how it was able to reach different types of clients in different areas of life. To me, that is crucial because I am able to reach a broader audience which in turn helps me package my product differently for different clients.
I think iAd works best when it's possible to create a fresh immersive experience. If you're only using the platform to repurpose content a user could easily find elsewhere, it may not be worth their time or yours. If the product or message supports development of content that provides value, entertainment or otherwise, for a user, the platform offers ample opportunity
I personally am not involved in the decision to renew the product, but I had only positive experiences with the product and thus would recommend its use and renewal.
I love Adstream because it does a great job at streamlining its ads to different components and different industry providers unlike Apple iAds and Google AdMob. It also is very helpful for a new business like myself to reach different audiences and hopefully generate some revenue from these types of diversified ads.
In some instances, we developed an experience for AdMob simultaneously with our iAd experience, working with both teams on a daily basis. While the Google team was skilled, receptive and helpful, Apple device functionality was broader and thus allowed for a little more imagination in bringing intuitive relevance to the creative content we developed