At £444.00/11kg with out shipping then my advice to the OP would be pitch up with a set of sticks.
Tuck you self in, work the wind. Seats are fine ( i have 6 home made ones) however for me I've shot more deer waiting with sticks than from my seats, or got down and stalked into them as they are out of range.
They all look very nice in the ad's but my money would be ( in this heat ) you would launch it after getting it set only to find a branch in the way of the sweet spot....
I'm with you Tim, it's exactly what I do. It develops your field craft and you get to learn the ground you stalking over in detail.
Don't get me wrong but sitting in a high seat is deer shooting, do it on foot and working the area is stalking.
It's like flight ponds and foreshore fowling, you end up with dead ducks but they are two totally different experiences.
Sometimes the added height is what makes the shot safe though!
I'm going to try one of these: SUTTER® | Portable and lightweight Free-standing Raised ALU Hide 3,0m