I booked a hotel on Priceline (or what I thought was Priceline.) The Priceline site actually sent me over to Hotel Planner. Turns out to be an affiliate that has different changing and cancellation policy than I thought I had originally agreed to. When my plans changed, I called the number given for service and I tried to modify my reservation. There I was told I couldn't and that I needed to cancel and incur a $25 fee and rebook (price of room was now $20 more). It took me 2 days and multiple calls to the hotel, Priceline and Hotel Planner to straighten this out.
Be careful not to be switched over. What is scariest is that when I asked what was Hotel Planner I was not given a straight answer by three different agents. Finally I spoke directly to Priceline manager who wasn't very happy with me, but did admit they were an affiliate.