No but I was looking with interest at the advert in the BASC mag. Looks like a good idea but I bet it takes a long time to get it hoisted.
I saw the ad in the latest Deer magazine and thought it looked pretty useful.... had a dig around on for anything similar and came to the conclusion it was just a glorified trailer weight ratchet strap. Plenty on fleabay and plenty of unknown quality too.... then I found an ex-army one but haven't got round to pressing the go button yet as I went sideways and was looking for a tree hanger to mount it on - nothing obviously suitable so I've got a design in my head but no means of making it........ and that's about as far as I've got.
The Napier does look quite compact though.