I feel bad as I think I recommended the Argos one to you. But to be fair mine is still going okay after a year, and they are pretty cheap.
It lets a tiny amount of water through if it is stretched too tight over the body work now, altought it started off 100% water tight.
Mine is only protecting my donor car now, so that is not really an issue, and as it has no doors letting the windows down a tad is not really needed.
The JPS will have a garage once it is finished. Mine you I need to get a roof on the garage first.....