If you're trying to get it super accurate, cut one piece of wood in half with the jointed side against the fence, then flip one half of it over and butt them up. If the saw isn't cutting straight, the error will be doubled by doing this.
IE. if the joint makes a 4° bend, then the saw is off 2°, but it's easier to detect when the error is doubled like this.
Ridged has a big name because they use to make TOP DOLLAR/SHELF plumbing tools. There power tools use to be lacking (except they made a kick ass shop vac) but I think in recent years, they are porbably in the top 3 to 5 brands. With Dewalt being the best for mitter saws.
It certainly kicks the $hit out of Ryobi or B&D.