More responsive than foam surfboards, they will turn easier. A good step between foam and hardboards.!
Improver surfboards are good to progress onto once you are consistently standing up and riding the wave in on a foamie. They are narrower at their nose and tail, reducing their volume and making them more responsive (and slightly less forgiving!). The construction of an improver surfboard is normally a hard or slick bottom, with a thin layer of foam on the top (deck) of the surfboard.
When progressing with surfboards it is very beneficial keep to a similar length surfboard, but change the construction and volume of the board. Once you are successfully surfing this then think about changing the length of the board.