We have two router tables, one built into a bench, and one built into the table saw, both of which use the inserts you can buy at just about any good woodworking store, and neither of which get used much since we go our Grizzly Shaper, which has a router shaft so that we can use IT as a router table. The bearings in that thing are so much more stable than in any router out there, that is just makes more sense to use the shaper. Cleaner cuts, faster feed speeds, and just all around better. Why waste money on a POS like that one when you can buy something which works.
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"Cowards can never be moral."
M.K. Gandhi