Hi. Depends on the revision of 060 you have, earlier units get more hot. That said they might not work at higher clocks anyway so end up being used with lower overclocks for users that decide to do it.
I have the latest mask and the one before that. My experience is that neither runs cool enouph to avoid at least a heatsink. It also depends on your ambient temperature a lot. I've found here on the Algarve (south of Portugal) that temps are only low enouph to bear with your fingers on the winter with temperatures of around 10ÂșC, even then they're very hot.
After adding a heatsink to my latest mask it doesn't need cooling without overclocking it. With overclocking a very small fan is enouph. I'm running my Cyberstorm MK2 at 80Mhz with just a small fan and it just gets warm. If I remove the fan it gets really hot though.
I'm looking forware to try 85/90/95Mhz if/when I get such an oscillators, should be interesting to find the limits:)