If I was to buy one for looks I'd skip the standard Fat Boys and buy an Executive Fat Boy instead. Only thing is you will wind up paying significantly more for one especially if it has the original case and/or packaging. As far as performance goes for Fat Boys you can depending how the adjustment thread is done under or over clock the adjustment knob to make them more or less aggressive for the adjustments.
To clock the razor either way adjust to 1 or 9 then depress the spring on in the adjuster knob. You should be able to turn the knob past the stop to 1 from 9 or 1 to 9 changing the gap adjustments for each setting in that range.
To clock the razor either way adjust to 1 or 9 then depress the spring on in the adjuster knob. You should be able to turn the knob past the stop to 1 from 9 or 1 to 9 changing the gap adjustments for each setting in that range.