The miner is not yet finished, as I always say, have patience guys. You can go ahead and test it, but bear in mind this is not finished software.
Update October 23:
I have been working on getting the host code integrated in zcash and improving it. I have added early support for testnet mining, and I am now working on stratum support. Next objectives are multi-gpu, stability fixes, etc.
Lots of work left, but I will be working on this full time until release.