Those look great, and very handy. Probably will give a superior shower to my simple set up, but then I can't stretch to those sort of prices. Also, I like to keep things simple.
My solution is cheap, and affordable, and nothing much to go wrong, and if it does is fairly easily and cheaply fixed, or replaced.
Everyone can pop to a garden shop or liddell and b and m and make this for themselves at very little cost.
It's very light, and doesn't take up much room. Perfect for one or two people to use.
If I had a family, I might want something a bit more efficient and robust.
This simple set up washed my long hair and gave me a good shower, though it did need a small top up to rinse my hair properly, but it was no more than a pint and a half. As I hadn't filled it right up to start with, I think a full, fill will do sufficiently. It's just a case of knowing how much water I needed. I was trying to keep water use to a minimum to start off with. The less I need to heat up, the better!
Anyway, I'm pleased with it.