I've also had a bad Orbitz experience. Tried to book a flight from CHM (Columbus, OH) to ISP (Islip, NY) for 4 people. Found a great fare at a great time on Orbitz, went to purchase the fare, only to find out that it was sold out. I searched again several hours later, only to have the same sold out fare come up again!

What should have been a 15 minute process to buy the tickets on Orbitz ended up being 2 hours of frustration on the phone to Orbitz customer service, checking other services (I had great luck with sidestep.com and qixo.com), and checking airline websites.

I will never use Orbitz again after this experience!