I think it's more for amateurs than professionals, TBH.
But, I'll admit that it's pretty powerful. But, I didn't really have that much of a problem using it. You just have to remember it works by creating a series of planes [infinite amount], but most times you can get the line to 'snap' to one of the major planes 'Up, down, left, right, front, back'. They have them colored. I believe Blue is up and down, and Yellow is left and right [Or front and back depending on your perspective].
Now making some of the stuff that JBFish makes with SketchUp, that's hard. Haha. That's why I give him so much props. That stuff's hard to do.