I won't mention names yet (maybe later), but if a company tells you that 3 people can build their pre-cut kit structure in 2 days, don't believe them. If the incredibly hard-working, dedicated crew of 7 that we had wasn't able to do it in 4 days, it can't be done.
Also, don't believe them when they tell you the lumber will be marked as to where it belongs (F=floor, W=wall, etc.) or that it "comes with the thinking all done."
We didn't believe some of their claims and knew that others were exaggerated, but we had no idea just how far off they would be...