I've got the 25 and 32 units in a table saw / router rail setup and another router table respectively.
As Garry says, the 17 is not suitable for table saw use, in fact there is some Incra blurb somewhere that says its won't work (not sure how).
As others have said, they are room hungry when extended to the right (or left).
If your router table is not actually connected to the table saw, you could mechanically fasten them and use the Incra rails - this way you get a precision fence for the router and saw at the same time (which is the route I have taken).
As for the quality of the product, I winced at first but when I saw one in the flesh for the first time, I purchased two within 24 hours.
One thing to note if you go the Incra TS route with rails, they are really designed for US style saws which are not as deep as European variants. I have a Hammer K3 and had to knock up an aluminium frame to adapt the length as it was too short.
In regards to recommendation; I would buy it again in a heart beat.