Very sturdy.  Great price.  Easy to assemble - even our 5 year old helped!  Actually, my only complaint was that the assembly was too easy and intuitive, so we didn't read the instructions closely.  Turns out that some of the parts look very similar, but it does matter where they go.  So had to partially disassemble and reassemble correctly.  Even with that mistake, total build time with two people was about 1.5 hours.  Read the instructions carefully and it'll take about an hour.  The quality is great.  This thing ain't gonna fall apart.  And the kids are very happy with it.