SinglePass Curl Ceramic Long Barrel Curling Iron - Graphite : I can't get my hair to hold curl from this curling iron :(

I wanted this curling iron to work SO bad. I saw all of the rave reviews and was thrilled when I got it for Christmas. I used it a few times over about 30 days and I used hair spray, which I never even have to use, but I could not get the curls to last whatsoever. I was so upset, because I wanted to love this tool and I wanted it to work. I made sure my hair was dry all the way, I used hair spray, texture spray... hair dirty, hair clean.. nothing worked. I had to exchange for the Dry Bar Mixologist and I love it. Not sure why I had these issues when not many others seem to. I tried it on my daughters hair and mine... nothing. I don't even have to use hairspray with the mixologist and the curls last days.. I just don't know, but beware.