Bankwest used to be owned by UK Halifax but were taken over by CBA in the middle of the GFC. Following that they restricted their access to a limited range of brokers and had an on again -off again attitude to offering some products through through their branches and not with brokers. As a result they have struggled, in the eyes of many brokers to re-establish credibility as a reliable source of funds.
However they appear to have lifted their game with a good customer satisfaction report recently and they still have independent policy. They also offer some very competitively priced products including a current 6.50% rate on loans over $1.5 million. They have recently released a low doc product and other competitive basic home loan products.