I ordered two kits Sunday, but they were waiting for one of the springs to come in to complete the kits. I received shipping notice today, and I should have them Monday. I'll install one kit in my plain Jane black CZ75b and get to the range by next Wednesday and report my experience. The other kit goes in my stainless high polished CZ75b.
Here's the only review reported so far on their website:
I have several CZ's in my collection from RAMI to TS Orange and all but the Orange, Shadow 2 and SP01 custom shop, had long and excessive weight trigger pulls. I purchased 5 of the spring kits and installed them and the trigger reduction was exactly as the video claimed in the installation video. I am very glad to have found these kits they in fact change the trigger so radically it's almost like a different gun, but they are sweet, thanks M*Carbo. The only problem I encountered was the installation tool kept trying to get away and there a bear to find if you drop them.