I have been using the AAP ratings on the QTAB site for over a year now,and find them reliable,what's more they are free,and I usually obtain them after scratchings each day.They also include Shane Templeton's tips,so that is an added bonus if you follow him, - I don't.

There are various other mentions of these ratings on this forum,so study these comments,they are well worth while
Cheers,Yubet