The Platinum program has been pretty good to me in the last couple of years. I received some nice gifts in the mail - poker chip sets, a bag from the North Face, a $100 card for Circuit City, a basketball jersey, and some other random stuff. Best thing was getting to attend their party in NYC the year before last with Brooke Burke there. They've also been pretty generous with reload bonuses and once even added $300 to my account as a gift.
Obviously it's not a sportsbook for everyone. Lines can be up late, grading can be slow, maximums are sometimes low, not many halftime lines offered, and they do not accept phone wagering at all now. But the Platinum program has certainly given me lots of nice perks and it's nice to get things in return for your business.