I should say I did not try the food, despite I really wanted, so my comment is only about service and reception.
The problem with high TA rating is that too many people want to visit the place, and the stuff struggles to cope with crowds, so welcoming guests becomes of no importance. I came about 2 p.m., without reservation, and tried to understand is there a table available. Waiters were coming and going, and ignoring me and other clients completely. After about 15 min waiting a group of young ladies before me managed to catch a manager (owner?) and to inquire about a table available. After another 10 min they were seated and kindly invited me to share a table. After another 10 min we asked for a menu, as the waiters continued to ignore us. And when finally the waiter arrived with a menus, he only gave it to my kind neighbors and pointedly ignored me again:). On this point I decided to spend my money elsewhere. Still don't understand why it was so difficult just to say from the beginning that the house is full and not to waste my time?
So, conclusion: if you are dying to try the food in this particular restaurant, book! and don't even show up if you have not. There are plenty of other excellent options in Zermatt; I finally got my late lunch at Schwarzsee and it was the best meal on the slopes!
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