I'll start this thread so any buyer/seller can give feedback.
Ive been gpu mining since around (late 2011 / early 2012) and now considering leasing my rig.
For rig leasing I'm considering following terms that I hope are fair terms:
Any downtime will be rounded up to the next quarter hour and added to the renting time + 1 quarter hour for the inconvenience. For example: 1h20 downtime = 1h45 added