If you are just getting started just now on design, looking at over a YEAR in finished product minimum, not considering troubleshoot, manufacture flaws, flashed software and its coding, plus the 2 months minimum of waiting list. 
The reason Butterflylabs is having trouble over a year is all of these reasons, plus they took in orders when they did not have a manufacturing system foundation. At the moment Butterflylabs are having issue with overheating with all of its product and do not know where the issue is coming from no matter what they post publicly. The reason being the 1,500,000 Ghash/s machine is being divided into two machines of 750,000 Ghash/s . This is going to take a very long time they have to physically redesign, manufacture, recode, and re-troubleshoot. The same goes for the smaller ones, again overheat issue cause by reasons they do not know. Which in essence is almost false promises and changed due dates, over n over n over.
The reason Butterflylabs is having trouble over a year is all of these reasons, plus they took in orders when they did not have a manufacturing system foundation. At the moment Butterflylabs are having issue with overheating with all of its product and do not know where the issue is coming from no matter what they post publicly. The reason being the 1,500,000 Ghash/s machine is being divided into two machines of 750,000 Ghash/s . This is going to take a very long time they have to physically redesign, manufacture, recode, and re-troubleshoot. The same goes for the smaller ones, again overheat issue cause by reasons they do not know. Which in essence is almost false promises and changed due dates, over n over n over.