You get what you pay for - I paid very little to paint my hallway and wall next to my stairs, and I should not have expected much. The work was done quickly, 2 coats in record time, but when it dried there was an obvious cut line across the wall and next to the trim. When I called I was told it was the pain that I used. I used a Dulux eggshell.
According to Pro Interior 2000, even though it's sold for walls, and I bought what I thought was the best product, you should never use eggshell for a wall.
Blame the material...