I became interested in keeping a few nuts and bolts in my workshop after having to make frequent trips to the hardware store to fix anything. The nearest hardware store is a 10 minute drive away, and unless you buy in a quantity of 100 there's a substantial markup, so it's not unusual to spend $5 on just a few nuts and bolts. It made sense to keep my own stock.
The nuts, bolts, and washers themselves all seem to be of decent quality. I haven't used them for anything too demanding, but they would seem to hold up to anything you might need them for in a pinch. The other reason I purchased this set, the plastic storage bins, leave a bit to be desired. They are flimsy and have a lot of flashing and sharp edges. However, they serve their purpose well. Each bin is mountable via a plastic strip that can be screwed into a wall or sheet of plywood and holds a row of 4. It is possible to configure the set in a few different ways, but plan on spending at least an hour mounting everything level and even. They will also stack on top of each other so you can also stick them in a cabinet or on a shelf. Despite what others have mentioned, I have had no problem with the labels.
My only real complaint with the set is that it comes with a few 5/8 bolts rather than any 1/4 bolts. I don't see much use for these unless you're making a skyscraper or repairing a streetlamp. However I combined a few of the bolts in one bin and used the extras to hold 1/4 nuts, bolts, and washers which I purchased separately (which alone cost about $30). Otherwise this is in my opinion a great value and has saved me many trips to the store.