I bought the radio trigger for my 550d, the processing can live, but could be better. On shaking the transmitter or the receiver clatter the trigger buttons, so have quite a lot of game. For this, the transmission power is really great. I can in the house, through 2 walls, outside trigger the camera in the garden, are an estimated 30m distance. Without Obstacles It's actually at the 100m. For the price you get do no better quality. The JJC or Delamax are similar, ie a matter of taste.
