Easy to assemble - only 8 pieces and 16 screws but the box is very long and quite heavy. It was not easy getting the box down our somewhat narrow hallway and into the bedroom where the bookcase was to be assembled and displayed. 
It's made of sustainable solid wood (from rubber trees that have stopped producing, I think) and very heavy at 92 pounds when assembled. I recommend getting some help with assembly because of the weight of some the parts. With my 15 year old son's help, we got it put together in about 15 minutes.
This bookcase looks great and fits perfectly into my mid-century themed bedroom where I use it as a Hi-Fi/Stereo equipment display stand.
The style of this bookcase really appealed to me not only because it is high quality and great looks, but it also reminded me of the Sutro Tower in San Francisco which I always found to be very cool looking when I lived there back in the 1980's.
If you like the style, this bookcase is a quality product that will make you smile.