I'm new at the game, picked up the DR-05, AT831 cards from Sound Pros (I also have CA-11's and Audio Reality binaurals), and a battery box. I'm loving the set up; low initial cost, easy to use, you can throw it all in camera case and seemingly get into most venues. I've walked in through arena scanners, hand wands, pat downs, etc.; venues large, small, and in between, all without issue. Carry your entire rig in one hand, throw it in the basket at the door, pick it up on the other side of the checkpoint.
I mainly started for my own enjoyment, to have "living" souvenirs of my experiences, although I've posted shows online as well. A whopping 6 shows into my hobby career, but I'm digging it. This website has a wealth of info, way more than I will ever use, and people who are certainly willing to share their considerable experiences and expertise.