Boy, lots to choose from. I watched the video on the Clam. The setup is fast. I can vouch for the Coleman instant screen room models mentioned. Here is a video for it- looks scary when they first unfold but not really bad.
They are also very quick to set up. Once it is unfolded on the ground the poles bend open at the corner, extend and pop in place. The process is to walk around and do all four. At that point it is done aside from wind support lines if needed. They claim 60 second setup. Alone it is more like 2-3 minutes for me counting unbagging. It is the size of a medium sized camp chair folded and bagged. From what I can tell between the two (the Clam and the Coleman) they are both quick setup. You may need the larger Coleman model if you want a picnic table inside. Either one is nice. The Coleman is about a third of the cost of the Clam. I do like the idea of the shade flaps on the Clam though, if needed. The Coleman gives you two exits.