I had one for sale at the Wilderness Gathering. I was only asking £25 and it didn't sell.
I have used it a couple of times. It is PU rubber coated so not breathable. It has bugger all insulation so it's not very warm, and It weighs more than all my other kit put together.
I may hang on to it for novelty value, or to lend to someone I don't like very much.