even though many critics about the fact that GP's rattrapante is modified from Valjoux movement, however, it would be normal for a movement manufacturer to modify the complication, base ond some robust movements in the market. I guess most of the automatique rattrapantes in the market are modified from something robust. (hope I am right)
I just read an article about Patek 5070. The movement is modified from Lemania!!! And this is the critics from non-5070 lovers.
I just do not care about it.