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I followed the same path as Frank, purchasing an ATF55 first and then buying a TS75 when they were introduced. I could use the TS75 for everything, the extra weight does not bother me. What does bother me is that the splinter guard on the TS75, designed to work when making cuts measured to the right of the saw, does not function when cutting 3/4" stock unless you plunge the saw to a depth that is way too deep for normal cuts. I now have a purchase a TS55 to go with my other two Festool track saws. If I could only have one it would be the TS55.