It works really good on my daughter. She has been keeping same 300+ for the past 12 months.
Its pretty safe provided you follow the right steps in cleaning and wearing.
I paid $4000 in total for the pair of lenses (12 months exam. fee inclusive)
We booked an appointment yesterday, Just 4 month the eyesight has gone up 50. Now is 175 left and 220 right. hopfully this will control the eyesight not going up as faster as now.