I have received the US-sensor as part of the Beginner sets of Fundoino, there also the totally simple process of commissioning is explained. The sensor you can even directly stuck on the Arduinoboard if the pin assignment is changed. When the project source code (the few simple lines) simply copied only clueless, the part is ready for use in a few minutes.
The accuracy I measured it with a ruler, the true distance (measured from the motherboard) to less than one cm exactly. What more could you ask for few euros?
