Plan2Model was ok; results were only as accurate as the dWG it was based on.
I recommend learning to use the program. With favorites set up properly constructing a model will be accurate, and can go quite quickly.
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
"Implementing Successful Building Information Modeling"