It's sort of true. WJEC were the only board to release notional grade boundaries (recognisably based on their old spec). The final grade boundaries were very close to these (no more than a couple of marks out). Their exam grade boundaries didn't leap up between January and June, either. Of course, there's no guarantee that it'll be like this next time. Having said that, I would definitely recommend them. Get yourself booked on one of their courses and check them out.