Bought to make a special cake for someone who loves loves loves doughnuts, and it was a hit. The tins were the perfect size for the cake mix I used. (The recipe book was pretty useless. Mostly it said "use a cake mix", but it did give instructions for care and cleaning.
The only issue I had with it was that the inside ring (the one that was supposed to make room for the filling, popped off one side during baking, meaning I had to cut out the trough on one side. Not a big deal, but the same thing happened the second time I used it. From now on, I'll not bother with it and instead just scoop out a bit with a knife or spoon and save on the mess in the oven where it overflowed on one side.
So, four stars because I will definitely use it again and thought it was a good buy, but minus a star because the inside ring was fiddly and didn't stay on.