One should really distinguish between DIYer and Pro when talking about the machines I think. For instance, duty cycle is surely critical for a shop but likely not so much for somebody tinkering around in a garage. No big deal if I have to wait 10 mins to finish something cuz the machine got hot. (Never happened yet, actually, I'm old and slow...) Of course, higher duty cycle may also mean more robust overall, but again that may not be an issue for lighter DIY use.