5th December 2011, 09:41 AM
I think the ZHC itself is a red herring, and any issues will stem from how the employer actually goes about assigning work and informing their employees who are on such contracts. For employees, I think the key thing is to have something else they can do in the hours/days they're not working...preferably something that pays! e.g. a ZHC would suit myself admirably (if I were employable as an archaeologist!) as I can work on web dev projects in those hours.