Are they worth having ?

Just the shade cloth ones ?
Yup. We had only the the mesh ones in the previous Expanda and whilst they only sort of reduced driving rain to an extent, they are a must for privacy so you can leave the bed ends opened up on warm days and nights. No-one wants to look at me dribbling and gurgling as they walk past the van early in the morning ... plus theyre like to see something that can never be "unseen". (there's counselling for that I suppose, and time might reduce the trauma)
Unlike the canvas cousins, you can leave the mesh flies attached which the great thing about them, and with proper seasoning of the canvas we happily got way with using just the mesh and never once sprung a leak from the many heavy storms we experienced. I made those mesh privacy screen out of Bunnings 80% shade mesh.
Our new Expanda came with the expensive Jayco canvas BEF and it is pretty impressive, but will be a pain in the ar$e for overnight stops because you can't leave it attached. So I'm going back to the future, and will be making a mesh privacy screen that we can use on a day by day basis and leave the canvas one for longer stays.