Head heavy rackets

[uspta146749877]

How easy/difficult is to coach a student playing 7 point head heavy rackets?
Just to keep it realistic
wilson promtes [k]obra which is 7 points heavy
See a spec at

http://www.wilson.com/wilson/racquet/all_rackets.jsp?CONTENT<>cnt_id=10134198673974773& FOLDER<>folder_id=2534374302756115

[llll]

dont know much about what type of racquet is appropiate for young junior but fot adults headlight and heavy(approx 12 oz) seems to be favored by the pros and better to prevent arm issues. who is this racquet for?