I bought this square pan to make carrot cake and I am fairly happy with it. I have made cakes greasing the tin with butter/marge and without it. The cakes come out fine both ways but as personal preference I tend to grease the bottom and sides of the tin just to avoid any potential sticking disasters.
The loose bottom of the pan makes removing the cakes very easy but buyers should be aware that the loose bottom is not suitable for very wet, runny cake mixtures as it tends to leak out of the bottom. But thicker batters are fine and do not leak at all.
It's also not the best quality material as the tin tends to bend in the heat of the oven. This is fairly standard with the cheaper pans as the metal is thinner than the more expensive pans. But don't worry it goes back to normal as it cools and it doesn't affect the outcome of the cake. I only mention it so that buyers are not worried if their pan gets bent out of shape or you hear it snap in the oven. It is perfectly normal.
My major criticism with this pan is that the loose bottom has a little rim around the edge which collects cake in the creases. Although this does not affect the cake it is a nuisance to clean. I have to run a toothpick around the rim several times to get all the cake out.
All in all it is an average non stick pan that will do the job, you get what you pay for.