If you order from BFL now you risk that they will have their asses sued of them by everyone who ordered a Minirig. Which never shipped and the replacement product has 1/3 the hash power and is 3 times as expensive. I wouldn't pre-order from a company with such an uncertain future no matter how good their product is.
On what basis could they be sued? Those unhappy can obtain a full refund at any time. If they decide not to get a refund, they'll get 3 x 500 Gh/s Minirigs instead of 1 x 1.5 Th/s Minirig.
If you ordered a sports car with a max. speed of 300 Mph would you be satisfied if you would get 3 cars that can do 100 Mph instead? I wouldn't. The minirig buyers ordered a 1.5 Th/s device, not 3 500 Gh/s devices (with 3 times the power usage).