Tony,
I considereed Morton before I built my building but decided to another way. Morton offered nice touches to customize the building and let it fit more with the architecture of other structures and appear less of a light industrial look. They are a large nationwide company with a good reputation and stand behind their work. The reason I went elsewhere was 2 fold: (1)cost, they where 50% higher (2)my main building is 100' x 200', morton typically uses trusses to support the roof and this prevented me from having a mezzanine for open storage. The only things I would have done different is built bigger and changed my eave height from 16' to 20/24'.