I've got a RAT folder that does well. Used it to clean some Brookies yesterday as a matter of fact. Good knife!
a couple weeks back, i got an ESEE 5 (formerly the RAT RC5) and i have to say i'm pretty impressed with it's versatility. there are knives i like more, but if i was only able to keep ONE knife, it'd be this one. in fact, it's my EDC.
I just bought 2x RAT7. One for each of my daughters. I need to polish up the edges on both this weekend... My oldest did get a chance to use hers this weekend at a camping trip. Works well.