I've owned most of the brands out there (Summit, Lone Wolf, etc) as I've spent years searching for the perfect treestand. Anytime a new hang-on (I don't use climbing stands) came out that looked promising, I bought it.
I discovered the Millennium stands 4 or 5 years ago. I sold the pile of stands I'd accumulated and now own over a dozen of the M100's. They are incredibly comfortable, and easy to hang. For my use (hang my stands in late summer and leave them up through November) they are perfect.
I've added their optional footrest to all of them, and it makes a great stand even better.
Highly recommended.