Alright, 3 things to say.
a) I've read about 250 comments already today that scream "CYBORG IS BAD BUY RAZER". No offence to any of you, but the lot of ya sound like a bunch of Razer fanboys. Razer is good, as is Cyborg/Mad Catz. It comes down to preference, style, etc. I recommend trying both out at a local store.
b) I've read a few threads about bad quality, etc. I've used a R.A.T 3 for about 2, maybe 2 and a half years now. Has never let me down. Again, I'd recommend checking in-store.
c) It really does come down to personal preference. I'm considering upgrading to a R.A.T 7 as I love the feel of a R.A.T, and the weight and adjustment system is brilliant. If I was to give an actual piece of advice, it would be this:
Razer - For some performance depending on the model. Somewhat lack of features, and build quality is rumoured to be bad.
R.A.T - Feature heavy, weight adjustment, length, etc. Build quality is 50/50 between excellent and terrible. Sensors have bad history for some.
So yeah. Just remember not to limit your options to only these few. I enjoy other mice too.