I have two or three boxed sets of the cheapies. They work well the first time, then the first thing to go is the lock screw hole stripping, the lock screw hex recess stripping, or the bit breaking from looking at it with a raised eyebrow.
Pure junk not even suitable for boat ballast.

Been holding off on a good set, but have eye-balled the Amana's a time or two. Apparently they are either quality or the hairy eye-ball has no effect through the interwebs when viewing pictures.
Don't really ever use them, but maybe if I had a decent set?