Only technically. I've been on the south side of the DMZ, but from the north.
I do want to check it out, but whenever I've had a chance to go south, I've also had the chance to go north. The country has been gradually opening up a little in recent years, and I kept getting the chance to do something I wanted that I couldn't before.
If you do actually go back, feel free to let me know. I'm always looking for an excuse to go, time/money permitting.
Sorry, but I saw your snake liquor picture and couldn't resist sharing my own whacky north korean booze: