I've built this stool often, it's about as simple as a stool can be. A top, two side pieces, and a through mortice stretcher. It is strong, stable, and when made with Red Oak very attractive.
Here is one of the legs. I'm using a Koyamaichi #2 White Steel chisel to chop the waste, it doesn't get much better as the chisel takes and holds a great edge.
Top with one leg:
I used the Moxon for sawing and marking the tails and pins, while I'm not completely sold on the Moxon it did a pretty good job holding everything in place.