It worked fine the one time I used it for a Saturday game - BUT - As AJ has said given its an evening kickoff and the bus doesn't leave Sandhurst until 6.55, the arrival time could due to the barsteward traffic, leave it very tight for KO.
I now use the park & ride from Foster Wheeler , which involves a short drive through Arborfield, which is far more user freindly than trying to battle your way into a car park - (and a damn sight cheaper too)