A heavy duty clutch is always good, as it is more durable. However it tends to make the car a little harder to drive as the clutch is a lot more 'bitey' (for want of a better word).
It also makes the clutch pedal heavier to press (unless you have a hydraulic clutch of course!!)
I guess you have to weigh up the pros and cons of having a clutch that lasts longer and having a car that's a little more difficult to drive (especially in peak hour).
Mine has a heavy duty clutch and peak hour sux, but at all other times I love it.
Hope this has helped a little..
It may look good and it may be good, but it's rubbish!