It's posible that one stick can work great and one can't. I tried to use w_scan and windows apps and my stick fails to find any channel. So i can't confirm it is very good.
This is possible that you have broken stick. But on windows I couldn't find any channnels too for DVB-T or DVB-C network. Just with CrazyCat TBS drivers and tvheadend I found channels for DVB-C. I don't konw how looks with DVB-T because I have very weak signal.