I read the thread and my have missed it but, there are already some reviews on the forums
Zoddt skeezix, some fellow German user wrote a very detailed review after he went to ED's house and i'm sure there was at least one other review.
I guess your looking for real evidence for your Dad to help pay for it.
I think if you get him to read the reviews, and watch some of EDs youtube videos, you may be able to convince him.
Edit. I think it may have been Notaz who did a review too can't quite remember just now