Rock Chips Repair... Langka! anyone try this stuff?

Hi, if you see my pervious post... I recently purchase a 2003 Acura EL... and anyone take the car to Highway will know that Rock Chips on the front of the car is just a matter of time... I did some looking around and find this stuff called Langka will able to do almost perfect finish... Does anyone tryed this stuffs?? I just order one...

http://www.langka.com/