Until recently I’d never heard of or seen this tool before. Then a headlight went out on my car and I had to remove three screws in very difficult location. I found a couple of forum posts describing how to remove the light bulb along with a few mentions of using a right angle screwdriver.
I was even more shocked to find one for $5 at the local Harbor Freight–the store of disposable tools. I’m okay with cheap tools as long as they get the job done. This one definitely did.