Picked up the Lee Valley tracks for the reloading and work benches this past year - a fun project to put in place, and very happy with the results.
I deliberately made the slot in the table about 1/8" wider than the track in order to ensure there would be no issues with crooked routering causing install problems - "just fill up the resulting gap with Lepages PL adhesive while laying the track into the slot" was my thinking. Unfortunately, when PL cures, there are tons of small bubbles that rise up to the top, leaving a series of open holes when you trim off the glue that rises past table level height. (Rub the wood and top of the rail with a release agent like clear shoe polish before installing for easier excess glue removal.)
If you can find/know of a glue that doesn't form bubbles (is there such a thing?) for that job, I'd recommend using that instead of PL (assuming that you're concerned about relatively minor details).
Of course, if you've got 6 foot router guides and good router control, the whole gap thing may not be necessary anyway...