Definitely the Millenium. Several of my group spent the better part of 12 hours on them each day for a week out in Kansas at the beginning of the month.
I even left two of them with my buddy out there when we came home...he is very good to me when we visit him to hunt.
I have had and tried lots, but this seat beats them all for comfort first, lightness and portability second and quietness ...maybe that should be second. Anyway they are great and we currently have them on sale for 10% off.
If you need one or want one that straps to a tree, the millennium has a great seat like that also and considerably less expensive...yes, we have those on sale too.
thanks, bigjim