KH fitted the Fairborne screen to my car. Can't say they made a particularly tidy job of the sealant and so I made and fitted some stainless steel trim around the bottom - this also improves sealing. More of it is described fairly early on in my Hertsmog thread)..

I think Melvyn Rutter fit a replacement stainless steel L angled front pillar in the middle, which is screwed into the scuttle. This makes the assembly more rigid.
My limited experience of driving with the standard screens certainly made me get the Fairbourn fitted. It does keep a lot of the wind and rain off.
Tim