I have the 980
Looking at it straight on it doesnt distort, but if you're trying to place rocks, plants, etc in the tank looking at it from the extreme above angle it magnifys everything meaning you have to place it roughly where you think it should go then take a step back and make adjustments as necessary.
Very good tank for the price i paid for it
One thing i dont like about it though is the built in filter at the back, it never seemed to work as well as my old external one, so I use it instead.