I flipped my rear after dealer sold me standard Bonnie sprocket (won't work). The offset difference didn't look like enough to worry about, especially considering how out-of-alignment my rear adjusters were for 20,000 miles. I bought an alignment tool when I changed my chain, my adjusters are a whole notch off. Chain is much quieter now. Wouldn't consider flipping front, too hooked. Can't be good on decel/engine braking.
