I put mine in the loft the day I took delivery of my van-2 and a half years ago now.Never used it and looks like something you could get tangled in whilst jumping up to the top bed-which, if you have the dexterity of a one day old giraffe like me then it could end in disaster.
The cover that slides over the top bed entry hole in the California is a better solution.
Its a bit fiddly to put on (a solution about as good as the front screen curtain) and you have to lower part of it to get down. I've only dropped a pillow once so far, so don't use it.