I have the IJoy Combo RDTAs. In fact I loved the 1st one so much I bought 2 more. The included deck is an easy postless build. The prebuild triple coil that is included is a nice but hot build and a little difficult to rebuild but it can be done. I also ordered a couple of velocity style deck for the combos, easy builds and wicks great.
I also have the Crius RDTA. Like Werkz said, It does not wick well on larger diameter coils but does well on 3mm or smaller. I prefer the IJoy Combo over the Crius as the wick holes on all the build decks are huge and you can really stuff some wicks in there. The airflow may be a little better on the Crius. My Battlestar RDTA is my favorite. Easy velocity style deck, easy to build and wick and hits like the champ every time.