i got a set of Joan Allan's ctx covers about 2 weeks ago and they are great very strong looking easy to see the screen and press the buttons.
i never liked covers before and dont use them but these ones haven't come off yet and i dont think they will till i have to wash them.
they are 2 part so you can remove the screen cover but still protect the handle, i have used a gun protective tap to cover the other bits of the detector as it leaves no residue behind.
im not sure if they are on their site yet but they are in stock and i think they are about £20 i recommend them especially as my miss's put a box on mine and scratched the screen
