We bought six of them and had no problem assembling them.  It was fast and easy.  They are quite light, but still hold the weight of an adult.  We decided to seal them and bought a ceder colored stain.  After a heavy rain storm, they seem to be doing fine.  Although they seemed flimsy at first, due to their light weight, they seemed sturdy after assembly. 

Pros: Easy to assemble.  Look great.