Typed in the GV, current A320 driver here. It takes about 30 seconds to get used to a side stick. In a small cockpit like a G Wizz bird you will really like the extra room the stick will give you.

As no mechanical advantage of a wheel is needed with fly by wire, the wrist movement can be very precise. Side stick comfort with Gulfstream performance (the part I really miss being in a bus) the new G500/600 will be a very nice place to work.

Don't be afraid of something new. Ask any 7X or Airbus driver.