I picked one up at the Dixie Deer Classic a few years ago. It is a lot more stable than it looks like it would be. The bottom spike easily goes right into a tree trunk, especially a pine.
What troubled me at first was the way the chain holds the platform on. The link doesn't actually go through a strong protrusion, the way, say, the Screaming Eagle link does through a J hook. The chain just slides through the attached hook. It just catches on the outside of the link. The hole in the link is not filled with any part of the hook. I worried that the chain could be dislodged with you-know-what results.
But despite my initial reservations, I must say the set-up seems to work just fine. From about 2 feet off the ground I tried my best to dislodge the platform and that never came close to happening.
It is an especially good stand for a longbow shooter because there is nothing to get in the way of your bottom limb.
I bought mine without the seat that is supposed to come with it, figuring that I could rig something and save myself the money. I did rig a Gorilla rachet strap-on seat which worked OK, but I grew dissatisfied with it and curious about the Climax seat, which bolts on easily.
I was too cheap to send for it in the mail and pay the mailing charge, but I picked one up at this year's DDC. It does save you a bit of hassle.
It might take you some time to develop confidence in the stand. I've been using Screaming Eagles since 1988 and they inspire confidence very quickly. I don't find either the Climax or the Screaming Eagle difficult to carry but I don't climb mountains with them nor walk more than a mile or so.
Of course, no matter what stand you use, it goes without saying that you should never leave the ground without a good harness.