i have a p-01 and it was my first decocker pistol. at first i was a little hesitant because of the decocker, but now i prefer decocker to safety in most cases. you can carry a decocker model uncocked or in the decocked position which is half cocked (really more like 1/3 cocked) to reduce the pull of the d/a pull. realistically it's basically impossible to accidentally fire a decocker cz with the stock d/a pull, and you always have the option to pull the hammer back for the first shot if you already have the firearm drawn if you don't like the d/a pull.
as far as differences among the p-01, pcr, and 75 compact... the p-01 and pcr weigh roughly the same with the pcr being 1 ounce lighter at 27oz, and the p-01 at 28oz. both have alloy frames, but the p-01 has an accessory rail whereas the pcr does not have the accessory rail, basically the same gun. the 75 compact however weighs somewhere in the neighborhood of 38oz
it's is basically the same gun as a p01 in design and having the accessory rail, except the frame is steel, and it has the safety. among the three, my preference is the p-01, hence my purchase of one, but if an accessory rail isn't important to you, the pcr is a great gun. i'm sure you've already done your research, considering your comment about looking at the other models because of the weigh of the compact, but figured i'd throw this out there in case someone comes in and starts to get curious.
back to the decocker, i feel safer with my p-01 uncocked or decocked than carring a manual safety gun cocked and locked.