Quality wise, these pans are pretty awesome. They're thick and sturdy, but not too heavy. Like another reviewer, I didn't like that the corners were a bit round since I was doing a fondant cake too, but I ended up just cutting off one edge to get a sharp edge. I lost about 1/2 an inch of cake, so not that big a deal.
The main problem I had with them was that I had a terrible time getting the cakes out of the 12" pan, which is the only one I've used so far. After the first two stuck badly, I really went heavy on the shortening and flour coating and that one popped out nicely, so you have to be very thorough in that task.
There is a indentation in the middle of the larger pans and I'm not sure what the purpose of that is, but I did find it annoying. I wish there was a fill line instead of a middle square. I also found that the cake temperature and baking times provided by Wilton simply didn't work for me. Just go with the tried and true toothpick test and you'll be fine, baking an extra 5 minutes each test until you arrive at a good time to follow later. I had to add about 15 minutes.
Probably the best thing about the pans though is ease of washing. I didn't really want to try putting them into the dishwasher, so I hand washed it each time and the cake came away very easily. I have a dark pan and a glass one and getting those clean is a nightmare.