Incredibly weak and unstable.  My husband has had to tighten everything multiple times since purchasing because things start to come loose, even with the washers on.  Now we are having to reinforce the construction with extra screws and bolts.  We are not overly large people, this is just not a good design.  Wood is not sealed. Seats are not large enough to sit on either side, so you have to straddle with the support piece between your legs.