I think it depends on how much your willing to learn and if you know basic networking, FTP SSH etc,
I work in IT so maybe I had a bit of a headstart but I found it all hard but straight forward. around 3 years ago I brought a dreambox 7020, This was my first entry into this hobby,
I would agree with all the others that its not a normal sat box, (look up hobby boxes).
However as a word of warning mine sat in its virgin state for about 6 weeks while I was working and testing everything out and reading up.
If you really want to put time into the hobby then a dreambox is great, It has a very steep learning curve but the rewards are even greater. Support is the best out there.
If however you just want a
Sky Substitute then a Dreambox is not for you.