I just did my first test cut with this tool using my TS 55. I was cutting 23/32 inch oak faced plywood. The track was hand held without any clamps.
Using a Woodpecker 16-26 square, I was about one Post-it note thickness from dead on at 24 inches. According to Google, that is about 0.003 inches. Some of that 0.003 inches could also be due to variation in the Woodpecker square. I may also become more accurate with practice.
Like everyone commenting so far, I am impressed with the ease of use and accuracy of this tool.