Panoramic doors

[Simon Man]

hi there

we are getting an extension and were originally looking at getting a 3.5m bifolding door. we were then told about panoramic doors , the ones that have each panel separate and slide and fold independantly. I was just wondeing if anyone knows any places that supply these, and are these usually more expensive than bifolds? also can anyone please advise on if these are as easy to fit as normal bifolds.

any advise is greatly appreciated!

thanks