I have the older ATF 55 saw and several Festool blades. I get totally acceptable cuts in melamine from the blade that came with the saw - 491952, 48 tooth "Fine Tooth Saw Blade". I bought and have used the melamine blade, 439686, 56 tooth "Special Saw Blade". While the Special blade does produce excellent results, I personally see no visible difference in the cuts using it or the Fine Tooth blade on melamine and veneer plywood.
I do get improved results from using an Amana 10" melamine blade on my table saw. With the Amana blade I get absolutely no chipping or tearout, period. The Amana is a high-ATB blade, similar in grind to the Forrest Duraline, but much less expensive. None of the Festool blades offer a high-ATB grind.
Using the Fine Tooth blade with the Festool saw and placing the outside (show) surface down on the cutting surface, I think you will find you will be happy with the results. Of course, the sharper the blade, the better the results. Make the cuts with a fairly slow feed rate, and the top side will be nearly perfect. Save your money for a Domino!!!
ps - I read the woodshopdemos pages referenced below, and John comes to the same conclusion - use the Fine Tooth blade. John has some additional valuable recommendations, so I suggest you read his review.