I've got the Lakeland one.
It does work, but in my warm house it isn't much faster than drying on a regular airer.
In my experience it took 12-24 hours to dry clothes, depending on whether you filled it up, how thick the clothes are. The clothes at the top dry quicker too.
I found it expensive to run too.
In the winter if I put a regular airer next to the radiator it dries just the same if not better.