Hello Satfand,
To be honest. I have a friend who bought a DM, but he is like zero in computers. I had to configure network, update images and keys for him. Ok, its a great friend, I do it for him. However, if you know what you are doing and ready for what Dreambox can offer you, then ok.
Anyways Dreambox or Dragoncam bought require some knoledge and if you have even bases of it, then the rest can be reached.
See the price
Dreambox or Dragon cam ? Dont forget, for dragoncam you need card loader and programmer also ( 70 € +/- ) !!
Dreambox is more interesting in one way, Dragon Cam i just love
If you want just get some channels and already have one receiver, then get a Dragon Cam 4.2 ( last version I think ). Read on forums on how to up date Cam to the latest software ( Pr*dator 3.24 if i'm correct )