We have a screendoor similar to what Jim/Joan have on WildBlue. The only difference is that the snap-in door also has a full length zipper running down one side that curves on the ends, to facilitate entry/exit.
The only problem we've found is that 1) really determined bugs find their way in between the snaps, and 2) when rolled up, the zipper creates a largish bulge in the roll. As a result I keep it rolled and stowed, not in place above the door.
Best,
Casey