A good review of a nice model! I've never had one, but remember hating it when my friends took out their wooden mazes, as I was never any good with it
This, though...
...is not altogether correct. Also the wooden ones come with replaceable mazes (no customization, though!).
http://www.pinkorblue.se/brio-labyrint-med-oevningsplattor-34020-a012245.html?adword=Google_PLA_Alle&RefID=SEM_SE0000_PLA&c=aw&gclid=CNvv-dT2x8sCFcYcGwodWL4IwQ