[JoeAltmaier]

Don't they use those screw-slot devices that you just turn a quarter turn and they lock? So maybe no difference there.

[alricb]

Yes, but these connectors also include a stud you need to screw into a hole.

In this case though, the Udden trolley [1] is made of steel and uses machine screws, but none of these quarter-turn connectors.

[1]: http://www.ikea.com/aa/en/catalog/products/10176471/

[qq66]

Those take a considerable amount of strength to "lock in"... I always do them when my wife and I assemble furniture. We are quite slow because we apply wood glue to every joint.