The Huntmore is a very nice chair that is well worth the money if it is used for its intended purpose. Darren said it best.
I also like the Double Bull Magnum Tri-Stool for a lighter, comfortable blind chair, but it doesn't have adjustable legs or a rotating seat, and is not nearly as well built.
The Nif-T-Seat is extremely handy, light and portable, but it is not made to sit on for a long time. Effort is required to maintain balance, and it does not have a back for comfort. About an hour on it is all I can stand before I get very restless. However, it is great for call and wait hunting for turkeys and varmints where you move around often and go to new setups regularly.
The Waldrop seat and others similar to it are comfortable and relatively light, although far more bulky than the Nif-T-Seat. If you don't have to move around as far and as fast, the Waldrop would be a better option for staying comfortable once you get to a new setup.
All of these seats have advantages and disadvantages, so you have to buy what works for your primary conditions -- or else buy them all and use the one that works best on a particular hunt. Since the original question asked about using a seat on the move, I would narrow the choices to the Waldrop and the Nif-T-Seat, depending on what kind of movement was required. For more movement, choose the Nif-T-Seat. For more comfort, choose the Waldrop.
Allan