I agree the distortion is annoying but it does depend on the tank.....the smaller bow front tanks seem to be worse than the larger ones. On top of that, I dislike them due to the difficulties with canopies, screened tops, etc.
With bow fronts and curved corners cleaning and distortion will cause you headaches over time. Stick to rectangles and cubes. Unless you are a baller and can afford custom tanks and pay a business to do your maintenance and cleaning. Just stick to right angles inside the tank.