Most comfortable chair, also very easy to setup - Eagle's Nest Outfitters Lounger DL Chair

I have tried few and this one is the most comfortable because:
- Tall enought to "hug" your back, just like a racing seat
- Cushioned head rest (non-removable)
- Cushioned side (non-removable): when you rest your arm on the side for long, it won't give your arm any marks
- Adjustable height (with legs or retracted)

Few other advantages:
- Tiny holes on the bottom of the fabric: rainwater will be drained and no gathered
- The frame is very easy to setup with tension cord connecting all parts of the frame
- Come with only 3 parts: bag, frame, and fabric. So you will never lose anything in the field. And easy to pack (roll frame over fabric)
- Come with non-removable cup holder: although it made from fabric, it just works
- Bag with shoulder strap, easy to carry around
- Relatively small when packed, about 24 inches long

Overall, it has very thoughtful design. My only complaint is poor color choice.