I use this double pedals for 10 years now, and despite all the tests I've done in other brands, I do not see anything mieux.Robuste, prcise, the single chain of transmission is trs fiable.Je can just blame the tendency to move slightly when I attack really high speeds in fast enough (tip infficaces soles), and the floor of hello mum.
The trs is good hardware, for a price that, if I remember correctly, had not darkening. J'utlise the first model, and not change it for anything.