I wouldn't say it's useless but they aren't primetime. You just can't get the tolerances you need out of them yet. The real world is all about tolerances and non mechanical engineers always forget this. We actually adjust our files for the 3D printer to get the tolerances closer. In the end, the speed, material cost, tolerances and finish won't make these printers ready for the real world in 2011. Sorry guys. And yes I do own a very nice Stratasys 3D printer and have access to an Exojet too.