I have and use G-3.5. I love it ! It has saved me plenty of balsa too. My son practiced on it for a few weeks and he made his solo flight the second time he held a real TX. He was able to take off and land with relative ease.
The guys that train people don't like sims because pilots don't really learn how to fly a plane technically correct.
There is no substitute for landing a plane in a real cross wind.