The saddle and the sling are the same product. I think one company bought the other one out. There are a couple of different models but they all offer the same moderate comfort level.

Overall, the saddle/sling is comfortable. However, there are really only three positions you can be in:

1. Feet on tree steps; slouched against the tree.
2. Standing on tree steps and leaning straight back against the sling - my favorite.
3. Standing on tree steps with knees against the tree (more comfortable than it sounds, but might be better with cheap set of knee pads)

After 5-6 hours, these three postions get old and you begin to daydream about relaxing in a cushy climbing tree stand seat. You can usually remain absolutely motionless in a tree stand for an hour or two but the saddle requires occasional position shifts. I try to compensate for this by hunting higher and selecting gnarly trees with lots of background cover.