You’ve probably already ran a search of the reviews on the Incra, but, if you didn’t do. Generally, they come out as well as on any tool I’ve seen.
Because of the jig’s versatility, the initial learning curve takes a bit of effort. After that, simple refreshers fall in the “duh” category.
I keep the directions somewhat close, since I get away from the box for months at a time and need training after each coffee break.
The most problem I’ve read about seem to be with not following initial set up directions, which can throw things off, of course. However, unlike most our home made jigs, the Incra just has to be adjusted. Everything after that is a cake walk.
It’s so easy to use, I made my wife some small planter boxes from cedar scrap (okay, they were really test boxes and I told her I made them for her). I expected them to last a year, because they had no drainage, but they’re still hanging together, after a couple seasons of being doused with a hose.