I bought a John Taylor (Phoenix) cover for my Plus 4.
I only use it for overnight stays.
It covers the engine louvre so prevents rain water getting into the engine compartment. The cover also offers an extra barrier to anyone up to mischief.
It can be used roof up or roof down.
On a trip to the Isle of Man, where it was blowing a gale overnight, I noticed some light marks on the paint work, which polished out where the cover was whipping with the wind.
Overall highly recommend.
