Technically ok, price completely exaggerated

many years ago, there were feather duster for a handful of Mark which were based on the same principle.
Now the Wedel has shrunk by factors, and the price increased more for more.
Have tested the Arctic Butterfly on a Sony SLT 57 and on a Pentax Kx.
In Sony, the Butterfly was unable even a single speck of dust from the sensor
to remove. The dust was loose and let himself slide back and forth, but not record
(I naturally on the static charge paid does not discharge to the camera body).
After that, I "tested" the Pentax Kx. On this camera, the Butterfly was a great help.
Sometimes you had to start twice to take the dust, but after two or three
Minutes of the sensor was sparkling.
The price is a joke, at 30 the company should be able to live very well. As with the magnifying glass
"Because of the bad conscience" still an excessive and much too large for a camera bag
Cassette included.
Technically 3 points (as we now times Sony and Pentax in the family have) and a point
Deduction for the price.