Extremely pleased with this purchase. Very solid base and shelves! 6 of the upper shelves are adjustable, but the base has fixed shelves only. I was a little concerned about previous posts stating damage during delivery, but this was packed very well with no issues. We chose to have the bookcase delivered to the room we needed it in. Very well worth the additional charge because it is an extremely heavy piece of furniture. We needed 3 people to hoist the shelves on top of the base because it weighs 200 lbs. Just love it!