Wow, never thought something so simple and great.
Bought a house with a nice big ""farm sink."" Had a nice bridge faucet, but no sprayer. Originally, buy a swivel aerator from the local hardware store, but couldn't reach the entire sink. Put up with it for over a year, but then got tired of having to use a bowl or cup to rinse the entire sink.
Saw this and figured I would try it. It is nice and solid. The double ball joints really do create an 80-degree angle. In fact, I didn't realize that it was a double ball until I thought I had maxed out the angle, and then pulled more and soaked myself... The spray is nice and strong and is fairly narrow so it is easy to control. Switching between spray and stream is nice and easy. Can turn in either direction to switch.
Overall, I wasn't expecting to be so impressed by something so simple as a faucet aerator, but this is just what I needed...