This is far and away one of the gold standard cat toys in my arsenal and I've given several as gifts as well.  Trying to help the newcomer  feel more comfortable playing with the rest of the gang? Bring out the Turbo Scratcher, sprinkle some catnip on it, sit next to it with the new kitty and gently give it a spin.  The new kitty starts to play and generally someone else comes to check it out & gets in on it too ... with you there to keep things calm and gentle and keep the ball rolling, it's usually just a short time before the ice is broken.