I wish them well too, and talk about them to privacy-minded friends, but I dont use them personally because I almost always wind up going to Google anyway...
Edit: Its been some months, Ill give them another try.
I'm not sure I get the advantage of DDG's bang commands over using browser search keywords. I have one or two letter keywords for the few site specific searches I occasionally use (I find I use Google for almost everything, these others rarely, for very specific things). With bang commands I don't get to pick the mnemonic and it is often more than 2 letters. Also, for some people bang commands simply might not cover all of their specific searches (I just checked that they do for me, but, as I said, with much longer syntax than my browser keywords).
Edit: Its been some months, Ill give them another try.