I haven't used any of these KBs myself, and I keep hearing that the weight is fairly evenly distributed between the handle and the main portion of the 'bell. For you regular lifters, you know why this is bad. For everyone else, several of the lifts are a lot more awkward than the DragonDoor 'bells.
I personally like K2Fitness.net kbs. Yeah, they're expensive, but they're almost identical to DragonDoor at (generally) 3/4 the price. DragonDoor has the highest quality 'bells, though.
Bottom line from what I know: I don't "endorse" one product over the other, but when it comes to kettlebells, you really get what you pay for. If anyone has a different experience, chime in.