Booking tours with a discount

[ozliz]

has anyone used hawaiidiscount.com? Their advertising has popped up on a few sites now due to my trip planning searches. I've looked for reviews but they've been a bit mixed. It seems transfers have some bad reviews but others say good things about saving money for other bookings on Oahu. While I do prefer to go direct, some of the discounts look worth it if I make sure to do my own confirmations direct.