The seats are very firm and will hold up well to a lot of use.  Perfect height for a counter height table. You may want to use a power drill for the 4 regular screws used on the bracing bars.  The legs are solid and if you will only tighten them half way , then flip the stool over and place it on a level surface, then tighten the rest of the way, the legs will be even and won't rock at all.