Sorry guys, I didn't intend my statement regarding the laser to be a trick question. I didn't see the need for stating the obvious, but judging from the comments, I was wrong. The laser obviously has no use when using a rail but would be for the times the saw is used without a rail.
Next question: who is buried in Grant's tomb? Groucho Marx would like this thread.
BTW, I have a circular saw with a laser and don't really use it, its nonessential.
The Festool TS appeared on "This Old House" in the 3/27/10 Roxbury Project episode. It was used on a guide rail to make a rough cut on a stair tread. Next, a Porter Cable saw was used free hand to make the finish scribe cut.