I wanted to let you know that you can now use TweenUI ad tags to run banners on the Sizmek DSP. This means you can create and publish, and later edit and re-publish banner ads and any changes will go live instantly.
Also, TweenUI has been getting a facelift lately and some features have been greatly improved. Check it out at tweenui.com/animator and I'd love to hear any feature request or feedback. And yes of course — it's all GSAP powered.