I have not seen that site before.
If its a scam, you can dispute it through paypal and they will get/give your money back I believe. I'm not sure what all you have to do though.
I suggest using Rex Grigg. Plenty of people on APC.com and plantedtank.net have used him, along with myself. His site is:
http://www.bestaquariumregulator.com. Before you had to email him what you were interested in, but I think he has a shopping cart on the site now. I think....