Yes I've tired it and I love it
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You simply add water to powder and stir, it will have the look and feel of mud. It has little to no smell and it goes on easy. It has no Ammonia or Peroxcide in it so you can use it the same day you relax!
. However it will only make your hair a couple of shades darker or lighter (the black colors are excellent).
It will gradually fade over two to three months, if semi-permeant is #2 and permeant is #3 I would say Bigen is #2 1/2. It is a nice way to dye without worrying about the extra damage hair dye can cause.
Hope that helps