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I know very little about zCash, so it's hard to say :)

I can totally understand that :) so many coins out there at this moment!
Coin it self is pretty new but price is about ~ 44-45 USD / zCash.

My friend tried to mine it for a few weeks on his PC, but then decided it was not worth it. Don't know if it's true though :)

hehe okey :) well it take some time and hardware to get zCash :P thats why I decided to build a 5 card miningrig(can see it on my blog). Since I started mining from day 1 the buy demand was huge :D so made like 200 USD in one hour of mining.

Is it difficult or costly to set up a mining rig?