I bought the 4, 19 gallon containers to organize my closet and I couldn't be happier. Looks played a huge roll in what I was looking for and I thought that these containers looked like something from a space ship. Additionally, I had been to specialty container stores in-person to find something similar and had no such luck. Prices for other containers that were not nearly as cool were more expensive.These containers were extremely easy to assemble as you essentially only have to unfold them and clip the sides and lids into place right out of the packaging. As far as sturdiness goes, they are holding clothes and other miscellaneous items in my closet. I'm not doing backflips off of them. As long as you aren't using them as countertops, they will be just sturdy enough.The plastic is of good quality, I did not have any weird chemical smell with my containers. They stack up on each other nicely and DO have wheels. I have mine placed on the carpet and do not have any use for the wheels. With that being said, I don't think they would roll any better than a hot wheels toy car. Although mine are stored in the closet, future changes would not prevent me from keeping them out in the open in a child's room, garage, or study area because they just look so cool and clean. I love the little handles that lock the doors closed. They give you a satisfying little click when engaged.