"Looked at the Millennium seat just now. Don't like the support straps that run from the back to chair arms. Looks like a recipe for bow interference, although it is a nice chair otherwise."
Nope, the straps are not an issue at all. Actually, the straps are flush, more or less, with your side. They provide good support for your arms too.
I just used the G100 this morning for the first time. I attached it to a military frame with the molle straps and waist support belt. It carries very well and weighs in at around seven pounds. Setup is very fast. Just unzip the pouch, which is attached to the bottom of the seat, and remove the three leg assembly. Insert the tubing inside of the hole in the seat and open the three legs. adjust as needed for the terrain. No bolts, screws, etc.
It is very comfortable and swivels silently. I was setup "inside" of a beech tree which still has it's leaves. The trunk of the tree was about 3" which is too small for the G300 model. That's one of the advantages of the G100. You can set it up and be hidden most anywhere. I really enjoyed being able to swivel and look around without causing pain to my neck and back. I have a herniated G5, had two surgeries 20 years ago, so I know back pain.
I also have the G300 which attaches to a tree. It weighs in at four pounds. The advantages of the G100 is that you don't need a tree and it swivels. Basically, it's the same seat and comfort level. Here's a pic of the G300
These are the two most comfortable hunting chairs I've ever owned and I have several. I never bought the huntmore as I don't care for the weight or the setup time.
I'd suggest trying the G300 as it has the same seat as the G100, but has to attach to a tree. It is so comfortable that you won't believe it. I purchased a set of cheap rifle slings from walmart and attached them to the G300 as backpack straps. You hardly even know the seat is on your back.