It all depends on the seller you bought if from and also the product its self. If the product does not have problems right away, you should be fine. I just ordered mine also and I looked at Ebay since I do buy quite a few things from there, in fact, I just bought a Altronix ALTV2416600UL3 24AC power supply for a camera I am going to buy. It was mislabeled as a ALTV2416UL which there is about a $100 difference between the 2 models. Their loss, my gain. When I compared prices on Ebay and other places, I could not find prices any cheaper than Ambient Weather for the Davis products other than Provanatge which I did not want to deal with. You should be fine with Ebay. I would say that 99% of the purchases on Ebay have no problems, but that 1% is what can make it a night mare. Since you are buying a reputable/quality product, you should be in the 99%.