I just got a mail from Minershare:
By purchasing for example 10% of a miner, you get 10% of the actual hardware. If it's 3300 GH/s - you get 330 GH/s. If in the end we sell it (depends on what customers want us to do), you get 10% cut of the sale price.
This makes it more interesting

it is safe if KNC does not deliver on time, but does offer extra mining power.