I haven't read every reply.
We recently renovated and have 2, massive sets. 1 off the kitchen/diner and 1 off a games room.
When they are open, I love the view and fresh air. There is very little fame visible with them fully open. We had the patio made at the same height, so it looks/feels seamless.
My downsides:
-We have clips that hold the door open when fully opened (the access door I mean). BUT, if there is a sudden, moderate gust of wind, the door has been known to unclip and slam shut with force. I worry that the dog or someone's finger will be caught and injured when this has happened.
-When we open the access door, we need to keep hold of the door because it acts as a massive sail and will just slam if not being held onto. If you have younger children, I'd avoid for this reason alone because when the wind catches them, they really do take some force to hold onto.
-Even with the doors wide open, we get flies circling in the kitchen and seemingly unable to find their way out again. I have traps outside, sprays and all manner of things which only help marginally.
-When we got the doors, I asked about fly screens, but the shop staff looked at me sideways. IF we'd had a sliding door instead, I could leave it partially open and have a screen sitting on the top.
-Leaving a sliding door only partially open, would also be helpful because we have a dog who likes to go in and out all the time.
-We too had an issue finding blinds wide enough to fit, so had to buy 3, separate sets.
I do like them, but, have since seen some very wide sliding panels with minimal frames, which would give a similar effect and negate the danger of them suddenly slamming shut.