Yes, cube coffee tables with seating cubes are very comfortable to use.
Because they don’t include a backrest, you obviously wouldn’t want to sit on them for hours to watch a movie or enjoy a three-course dinner. However, they’re perfect for an informal catchup or a quick meal.
Plus, because coffee tables with seating cubes are available in all kinds of designs, you can easily find the type of surface that you find more comfortable to you personally, whether that’s upholstery or one with cushions.