Mine tried it looooong ago - they liked it twice, then wouldnt touch it - I tried everything they suggested to get them to eat it and tried other flavors. Na da.
LuvMySissy and others' dogs have great success with it. I think it's a wonderful food and love their philosophy - but I do think it's really hit or miss in terms of palatability (maybe more misses than hits, it seems). But an awesome step up in terms of quality!!!!!
I feed Natures Variety Raw Medallions now (whereas HK is kind of considered freeze dried raw).