My Ridgid R4512 table saw is one of the best tool purchases I've made. However, the included miter gauge is a no-frills piece of equipment. It's sturdy and does what it's supposed to do I suppose, but I had been seeing the Incra Miter gauge on multiple videos, and decided that's what I needed....which is the latest addition to my arsenal.
Perhaps the best and most basic function of the Incra, is how precise it is. It has a fence that will extend all the way to 31 inches. It includes a flip up fence stop, etc. I'll stop right there, as you can click the picture and read the features right off the box. I love how they claim that the Incra makes "devastatingly accurate miter cuts".
I have a table sled, but this just about eliminates any need for it. I haven't tried to make a picture frame using this yet, but I don't think the corner angles will be an issue.