I have used this pan now 6 times in total, and each time a success. The first 2 trial runs were using package cake mixes, but now I just use my own batter. I have to say, twice I used this in my friends oven, and the cakes were a disaster. One of my other friends also claims that she makes the perfect giant cupcake, yet it doesn't quite deliver at her mother's house. My oven is fan assisted, and pretty fierce, I always have to shorten the cooking time by about 10 min. The cake bakes evenly and beautifully. I fill both sides up about 2/3 full. Place the bottom side of the cake at the back of the oven as it takes longer to cook. If you're using a packet mix, try Jane Asher, use 2 boxes and bake for about 40-45 minutes. If your oven is reliable, then you shouldn't have a problem.