For those of us working from plans created long ago for airplane designs that are less common, having the ability to detect inaccuracies is very important.
While still a newbie with SOLIDWORKS, I was able to quickly sketch up the next part that I'll be working on. Sure enough, some critical dimensional inaccuracies were caught. Drilling wayward holes in my spruce spars would have been very expensive.

I'll attach a couple of screen shots via links.

Original Plans:
http://zoemertech.com/ad/discrepanci...tt_Fitting.png

SOLIDWORKS:
http://zoemertech.com/ad/discrepanci...ment_holes.png