Backless stool makes our kitchen look so much bigger.  They tuck right under the counter-height bar area.  Comfort is fine for short-term but after awhile it starts to hurt the backside. We are all on the slender side.  I can't imagine a larger person liking these stools.  Foot bar should be lower for the counter height stools.  My knees are bent so much they hit the wall. 
However, I do like them very much.  Stylish and unobtrusive.