I have two of their items, a jig with gauge (see picture) for aligning blade and fence which I only use occasionally, and which I'd hate to be without. I found out my fence is not quite flat, with about 4 thousandths variation--negligable.
The second item is their router plate, see pic., which is close to 1/8th inch thicker than competitive plates, and it has a twist lock insert that is convenient, and has a set of inserts of various sized openings that fit.
Very expensive and many items that look like a solution without a problem.
The more I do, the less I accomplish.