The 500 is quite obviously the best looking heli out there - its shape is ubiquitous much like the 206 - but impossible to improve on - like the Rolex Submariner or the Fender Stratocaster.
So how could the man responsible for the benchmark against which all other light helicopters are measured have designed the pinnacle of ugliness that is the Enstrom? (good though they may be...)
Having said that, if you remember the old Citroen ads - the guy who made the Lamborghini Countach also designed the Citroen BX estate!