Ozy, I haven't had any rusting issues with mine. I haven't done anything to mine short of wiping it off when it gets wet. I work in a heavily chlorinated environment so anything that is going to rust, rusts pretty fast and pretty hard.
Maybe you got a bum set of pliers? I have had rust spots/pitting issues with my Fuse, but that set in a tool box and didn't get the wipe down that the CX has gotten.
The CX is a nice tool if you are a multi-tool fanatic like many of us. Does it have its place in a collection? Sure! It is way more than just "functional" and certainly more than a novelty. Does it completely reinvent the multi-tool? Not really. I pack mine because it has usable pliers (more so than a standard SAK model that comes with them), it has a pocket clip, and it has a bottle opener.