This product is in another league to other bolt-together types I have previously purchased from elsewhere. The design of these shelves makes assembly quick and easy. Once fully assembled, the system is sturdy and fit for purpose. The optional wall fixings not only provide additional peace of mind but significantly improve overall stability of the shelving system. I have utilised the 150A shelving unit in my garage to store tools and maintenance equipment. The only weak spot may prove to be the MDF shelves - time will tell but, fingers crossed, with due care they may last for many years.