I bought one of these systems this winter and began putting it together this spring with 8' members (no cutting). It was surprisingly easy to put the frame together. The day I got the frame together a terrible wind storm blew up and tossed the frame across the yard and only stopped when it hit the fence.
The plates bent terribly out of shape so much so that they could not be used again. The company would not back up the product and the whole thing was a waste. Keep in mind that after wood, plates, and hardware the frame alone will cost you $200. The bolts alone cost me over $50. Since the company would not replace them or back them up I did not get another set and ended up building a traditional goat barn instead.
My neighbor built one of these and has gotten to the roofing part of it. He says it is a pain to roof it, but is coming along.