Yep . The treestand Company that started it all. Baker. Thrills chills and spills.
Great advice. Just practice and take it slow at first and use a harness. You'll be fine.I hunt about 90% out of a climber. I use a rope style tree strap to tie off to the tree as I climb. Definitely need to make sure top and bottom are tied together. Stick to trees that look like a telephone pole until you get used to it....then you can move on to knotty trees or trees with a lot of flare at the bottom.
The funny thing is: I feel safer in a climber than I do in a hang on with sticks. I use a TreeWalker climber. You might want to check that out...its absolutely rock solid on the tree. I'm sure the Summit is fine as well...it's a very popular stand. As others have said, practice in the day time a few times and stick to straight trees without a lot of big knots until you are comfortable.
One other thing to be aware of...when you're setting up the climber at the base of the tree you need to make sure it's angled up. As you climb, the diameter of the tree gets smaller and the angle will decrease. If you misjudge, don't climb past the point where your seat and platform are parallel to the ground. You'll get better at judging this as you go along. I try to set the platform high (like above my shoulders) as it gets easier to judge once you get past the "flare" at the base of the tree. Then, I pull it down to where I can climb in. If the tree has significant flare at the bottom you're angle can be pretty severe to start. I carry a screw in step with me that I use in case its too steep to climb in on the ground level.