I have one...its money. I have 10 receivers....so I can have 10 different sets without having to have 10 stands, and without having to leave my stand in the woods. I use climbing sticks on most of them, screw in steps on some. I'm gradually getting away from the steps.
I think the biggest advantage of the Millenium is that you can set up multiple stand locations ahead of time. Then you just choose the stand you want to hunt, head out and climb up and you are ready to hunt. The stand is relatively light, and comes with backpack straps. I just climb up, slip the stand in the bracket and get in. As far as comfort goes....you can't get any better. I've hunted all day in mine many times, no problem. The only drawback is the fact that the stand doesn't have a self leveling platform...but that is not unlike most stands out there. You just have to set up on a tree that is straight, not a huge deal. If it had that (and I have no idea why ALL stands don't) in my opinion, it couldn't be beat at all.
If your hunting style is to change stand locations every hunt...pack your stuff in and out each time, this may not be the best setup for you. But if you have the ability to set up your stand locations ahead of time...itsthe ticket.
I bought mine online from where you are looking, good service...I would recommend them. Enjoy!