We've had this screen door for about 12 years and really think it's a good alternative to a pricier installed screen door. We weren't in a financial position to have a screen door installed at that time, so I ordered this one.
It's a flexible fabric screen supported on an adjustable tension rod. The rod is secured at the top of the doorway, and the screen hangs from it. Here's
a similar screen from Home Depot. The one in the link is for a single door. The one we have is for a 48-inch width doorway (which works on our 48" French doors). The screen goes up in under 3 minutes and requires no skill to install.
We need a screen for about 3 months each year. At the end of the season, I take it down, roll the screen fabric around the tension rod, and store it upright in a closet.
Our particular screen has an opening down the center. We don't use that opening. Instead we simply push the whole screen out of the way as we come and go. It falls back into place after entering or exiting.
So a price comparison -- the Home Depot 36-inch single instant screen door sells for about $24 (I think we paid about $30 for the 48-inch screen). A framed screen door (that would require installation) would cost upwards of $100 for a 36-inch width.
I just wanted to share this, as I think it's a good, budget-friendly alternative to a pricier screen door, especially for an area like mine, where I only need screening for 3 months out of each year. We actually prefer to not have a screen on this door the rest of the year, so we can see through the window better.