I actually think 150 feet would be fine. I've never ever flown above 200 feet in my life, even performing a blender (not on the freedom, btw). The best thing is just fly 3 mistakes high. That altitude varies for everyone, if you are co-ordinated and know how to pull out of a mess up, you can fly pretty low. My normal flying altitude is about 75-100 feet except when I drop to 20-30 for some high speed passes on my faster bird.

My friend learned on the Freedom without a single crash. And taking off from the ground is ok, but throwing it is much better for a noobie because landings are more difficult on the hard ground needed to ROG and land.