I agree with it that RADD is better for learning your first hover than sim, much better IMHO. Personally, I followed RADD's to the letter, and did my first real hover without a crash. SIM is good if you know all the basics, and want to try some more risky new tricks, at least you get a chance to figure out the right stick movement before trying it in reality. But learning from scratch, sim will help, but you will certainly crash a lot if you think hovering in a sim is the same as hovering in real life, especially with a mini or micro.