Only the person making this purchase can answer your questions.
For many £110 is a great deal of money to be spent on something that may not work. On the other hand for others it is a gamble worth taking.
Consultation with experts in Autism such as the National Autistic Society regarding the success rate with this software is an obvious way forward.
My wife is a teaching assitant with special responsibility for two autistic children and her view is that an iPad would be fragile for her charges but makes the point that this would not be the case for other autistic children.