Toolbox replacement time. Suggestions?

A friend of mine who used to build engines for a living owned multiple snap on boxes that he bought when he was young, and many more HF toolboxes he bought later on in life. He always said that they're cheap enough to break multiple times before they reach the same cost... and he had not been able to break any of the HF boxes yet. When he passed away he left about 15 boxes to his kids and 80% of them were HF brand.
For the record, as far as his tools went, about 90% of the tools he owned were off tool trucks, and the other 10% were specialty equipment or measuring instruments.