Dana Dolly works well, easy to transport, fairly fast to set up, and can handle a pretty heavy camera setup 45 - 50 lbs. Works better than anything else I've seen in it's price range. Not sure that I'd fly a jib off it though. It's basically a hi-hat with skateboard wheels and would flop over with an unbalanced load.
My only experience with Kessler products has been mixed. Been fine for DSLR work but not for cinema cameras and lenses.