Most good track guides I have seen require a mod to the circular saw that is not easy to undo to make sure the saw doesn’t go off track. This one is nice since the guide is removable from the saw relatively quickly. It can also be used with a router, jigsaw, etc. I like how the slid is all metal tool.
https://www.homemadetools.net/forum/multi-tool-track-guide-video-86422?homelistings#post185442