I bought one of those $20 drills that Trumpy posted about, for use about the home workshop. The reason? It came with a 13mm chuck which none of my other drills had, and a new 13mm chuck would cost about as much.
My opinion of this drill? Well I wouldn't give it to a tradesman to use at work (it would have a depressingly short lifetime, I fear), but is seems quite well constructed and should last OK at home as long as it isn't abused. The speed control is fine enough to let me drive 2 1/2 " woodscrews without destroying screws and bits. It came with a spare set of brushes too, which I thought a nice touch.
All in all not a bad effort for $20.
My switchboard-building workmates here favour Makita or De Walt power tools, and seem to get a good run out of them.
