I get the impression that the fares are lower than the AC and WJ website fares, but they're not exclusive to Hopper -- they sell the same "secret" fares to othe

I get the impression that the fares are lower than the AC and WJ website fares, but they're not exclusive to Hopper -- they sell the same "secret" fares to other travel agents. In which case, should we be checking the price on kayak.com or similar sites when booking? Normally I book directly with WJ or AC because I assume that will always be the cheapest, but perhaps my assumption was wrong. Anyway, it was silly of them to put out this press release without running it by AC and WJ first.