depends on the hunt
Most of the replys have echoed my view point about elevated hunting vs ground hunting. I would have to say it depends on your hunt, type of ground, and season.
For years I hunted deer from the ground, moved to elevated stands and did better. However here in Mich. the deer are looking up but in many areas now but a elevated stand gives you a much better view over the area and to see deer.
However..as a part of a rescue at heights team, I have always used some sort of harness when putting up a tree stand, climbing in and out of the stand and while on the stand and taking down a stand. Too many examples of people falling or getting hurt from poor construction, poor choise of trees, cold and careless. The old belt style works if you put it over your ribs to absorb the impact of a fall, if it is around your waist you normally will be flipped upside down and your head will wap on something hard and painful. Again, body harness is the way to go plus have a knife handy to cut yourself out, sometime ya all should sit in your saftey harness and see how easy it is to get out of when all of your body weight is on it..good luck.
Now..when there is a fresh snow and I can track a field, it is a blast to track deer in the am after a fresh snow. Another fun ground hunt is stalking a corn field row to row. Again, a totally different deer hunting experience to see how close you can get plus both work when the conditions are right.
There are areas I hunt that no trees are available, time to work on the ground which has been productive for years, just takes a different set of skills.
Each system you may use has it benifits and saftey issues, just enjoy each one for the area you are hunting and what you are hoping to bring to the hunt experience.