I thought I'd pass on my experiences and opinions with 3 different hotel chains, all of which advertise a "best rate guarantee" program. 1. Hotwire. I'm currently "two for two" with regards to successfull claims against their "double the difference" program. Both claims were for the same hotel. Details can be found here.... Hotwire Double the Difference 2. Hilton. Their offer is to match the lower rate you find elsewhere, then send you a $50 American Express gift card upon check-out. In late January, I was looking to book the Embassy Suites South San Francisco (SFO airport area). Hilton.com quoted the following rates: $125.10 Two Queen beds $125.10 King bed Expedia quoted the following: $119 Two Queen beds - ballroom proximity $129 King bed I figured I had a successful claim with the room w/2 queen beds. I purchased the room from Hilton (internet rate--immediate purchase required) then filed the claim. They denied the claim saying the queen room I purchased was a different category than the "ballroom proximity" offered by Expedia. Okay...so they want to get picky! I responded back (via email) asking why the "ballroom" room didn't appear at Hilton.com, when it did on Expedia. I never did get a response. I didn't pursue any further as I suspected I'd never get anywhere. The ballroom rooms did appear on Hilton's website when I randomly checked for another date, eliminating my suspicion that Hilton gives Expedia that type of room to sell exclusively. I've had other customer service "issues" with Hilton over the years, so it came as no surprise when they didn't respond to my question. Bottom line.....I don't trust Hilton and try to avoid them if at all possible with my Priceline & Hotwire business. 3. Kimpton Group Their best rate guarantee program isn't as lucrative as the others (no cash perks, etc) but they do match any lower rate you find, plus upgrade you upon check-in (subject to availability) and give you late check-out (2:00pm). I've been looking to book the Topaz in DC in April for 3 nights. Hotwire sells this property, however is not displaying for the dates I'm staying. Kimpton's website is selling rooms for $259 per night. I did a Yahoo search on the Topaz to see how many different companies book rooms there. I searched through many a website, all quoting the same price as Kimpson directly. Then I stumbled across RoomsForLess and was surprised to see they sell the Topaz for $130 per night, taxes included. On-line booking was not available, so I called their toll-free number. The agent asked for my dates and confirmed they had availability at the $130 rate. I thanked her and then called Kimpton to book directly. I told the Agent I wanted to make a reservation under their best price guarantee program. She booked me at regular rates, then transfered me to a separate department for handling. I gave the new Agent the website for RoomsForLess. She put me on hold, then returned to say that although the rate was valid, it was not available for my dates and I didn't have a claim. I told her I had received verbal confirmation of availability from RoomsForLess and suggested she call them. She agreed and said she would call me back "within 15-30 minutes." One hour later she called back and confirmed the rate of $130 to me for all 3 nights. I'm not sure what all went on during that hour, but I knew they didn't want to give me that rate! The late check-out was especially appealing (aside from the upgrade!) as we have a 9:00pm flight home. After three experiences, it's obvious these hotel chains want to wiggle out of the guarantee whenever possible. I'm sure they expect when you do find lower rates, it's only a matter of $10-20 on Expedia or similar. Certainly not half the price I found at RoomsForLess. Make sure you print web pages offering lower rates, get names and phone numbers of who you speak with, etc. You'll need it for ammunition when you fight the big boys! My allegiance certainly goes to Hotwire, as their program is by far the most lucrative. In addition, you don't get locked into the "queen" vs "queen/ballroom" controversy with Hotwire! Just find ANY room type priced lower than your Hotwire purchase and you're probably home free.