did not use them but i did meet the fellows and listened to their deal...as you would expect you exchange paying peter to pay paul for the info provided...best thing you could ever do is find out a reasonable per square foot building cost for the quality and type of structure you need...some say the "going rate" is around $150/ft for custom residential with all bells and whistles...maybe 100 for low end specs...it was a whole bunch lower than that just 2 or 3 years ago...and with the market like it is per/ft prices should be receding like home prices are...but are they?...u-decide...good luck
I would not expect construction prices to drop any lower. While labor may be slightly lower now because there is not as much competition, materials are the major cost. Wood is at a good price right now, but PVC (oil based), steel, and concrete are high and not expected to change. The major cause for this aside from the oil prices, is the worldwide construction market (China) and the weak dollar.
Also, I don't think your $150/ft estimate for custom residential is accurate. I'd say that is a more accurate price for a mid-grade home--granite, mid-grade stainless appliances, hard wood, etc. To get "all the bells and whistles" is variable, but consider that it is not uncommon to spend $40,000-$50,000+ just on high end windows and doors, and you get the picture.