Without having the "Is is right to steal a keg from a brewery" debate...
I think that is a good kettle for the price. I've seen that model kettle before. Our main concern with it was the handles. The kettles have spot welded handles and seem a little weak especially for 15gals. Personally I would like to see some close ups of the front and backside of the weld though.
I have the two port version and I love it. Right now I'm doing 5 gal batches. I also use it for my boil. I've mashed 9.5 lbs of grain in it. I got it on preorder and it was a great buy.