I purchased 3 Billy Bookcases from Ikea a few years ago and they are still standing and in mighty fine shape considering they have been through two house moves! Sometimes with these self-build projects you find that each time you disassemble them they get chipped and weakened in some way but this is not so with these bookcases. They feel ever so sturdy in spite of the fact that I keep more than 250 dvd's and a few ornaments in each. Clearly they are not to be climbed on but I caught my toddler standing on the lower shelves and I couldn't believe they could hold his weight (just to give you an idea of how heavy duty they are!). The shelves are adjustable to you can have them higher or lower and there is a bracket/tie which comes with the flat-pack which enables you to attach them to the wall so that they can't accidently be pulled over. I have average skill with a screwdriver and hammer and I was easily able to follow the enclosed instructions and put them together in not very long at all. I'm really pleased with my purchases.