Sansevieria masoniana eventually gets BIG, but it is otherwise as easy to grow as the others, I think. My plant is still relatively young, but filling up a 6" pot.

By big I assume you mean it will eventually outgrow a pot placed on a window sill? I have the regular Sans, and when they threaten to outgrow their 8 inch pot, I divide and conquer so to speak. But if the leaves on Congo Paddle get huge then they would bump up against the window and that wouldn't work. Hummmm....