We bought the Thomas table for Xmas for DS & its been a brilliant purchase! It does take up a fair bit of space so we just sold our 2nd coffee table that we rarely used & replaced it with the Thomas table. Its great to keep everything in the one space, otherwise there would be tracks all over the house! Our dogs also like to chew the wooden tracks, so we can't have pieces on the floor. DS loves helping us organize a new circuit for him.
We bought a few of the Thomas sets with windmills, tunnels, cranes etc, but you need to get a switching or crossing track pack as well. If you don't, you'll have trouble connecting the pieces & getting the most out of the space of the table. We're just about to buy some more elevated tracks so it becomes even more fun!