High quality - every piece was accurately sized, predrilled, and fit together perfectly.  Made from nicely-finished smooth wood particleboard; much sturdier than the plastic Disney Castle/Barbie junk. 
Easy to assemble (you'll need just a standard Phillips head screwdriver). Pictorial instructions are easy to follow.  There are lots of parts so plan on spending 3-4 hours to assemble - that's what it took this Grandpa.  My granddaughters (5 and 7) love it!