I got a chance today to try out that Trekology chair while fishing. It was quite comfortable for the 2.5 hrs we were there. The adjustable legs have a big advantage. The lake banks were steep so I shortened the back legs and lengthened the front ones. That keeps the chair much more level.
FWIW, the fishing was pretty slow. I only had 2 bites in 2.5 hrs. However, each bite produced a 19" trout. I blame the chair.